4-Letter Nouns Ending With O

Here's the list of all the 181 4-Letter Nouns Ending With O in the English Language.

The list is arranged by the word lengths. Click on the length below to jump to the relevant section of the page.

Common Nouns (with Definitions and Examples)
info
1. a message received and understood
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auto
1. a motor vehicle with four wheels; usually propelled by an internal combustion engine
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logo
1. a company emblem or device
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zero
1. a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential
2. a mathematical element that when added to another number yields the same number
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euro
1. the basic monetary unit of most members of the European Union (introduced in 1999); in 2002 twelve European nations (Germany, France, Belgium, Luxembourg, the Netherlands, Italy, Spain, Portugal, Ireland, Greece, Austria, Finland) adopted the euro as their basic unit of money and abandoned their traditional currencies
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demo
1. a visual presentation showing how something works
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echo
1. the repetition of a sound resulting from reflection of the sound waves
2. a reply that repeats what has just been said
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solo
1. any activity that is performed alone without assistance
2. a musical composition for one voice or instrument (with or without accompaniment)
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hero
1. a person distinguished by exceptional courage and nobility and strength
2. the principal character in a play or movie or novel or poem
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mono
1. an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing
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ciao
1. an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)
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polo
1. a game similar to field hockey but played on horseback using long-handled mallets and a wooden ball
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expo
1. a collection of things (goods or works of art etc.) for public display
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trio
1. the cardinal number that is the sum of one and one and one
2. a musical composition for three performers
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memo
1. a written proposal or reminder
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alto
1. a singer whose voice lies in the alto clef
2. the lowest female singing voice
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halo
1. an indication of radiant light drawn around the head of a saint
2. a toroidal shape
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keno
1. a game in which numbered balls are drawn at random and players cover the corresponding numbers on their cards
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peso
1. the basic unit of money in Uruguay; equal to 100 centesimos
2. the basic unit of money in the Philippines; equal to 100 centavos
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homo
1. someone who is sexually attracted to persons of the same sex
2. any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage
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mayo
1. egg yolks and oil and vinegar
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limo
1. large luxurious car; usually driven by a chauffeur
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deco
1. a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production
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coco
1. tall palm tree bearing coconuts as fruits; widely planted throughout the tropics
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mojo
1. a magic power or magic spell
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taco
1. (ethnic slur) offensive term for a person of Mexican descent
2. a tortilla rolled cupped around a filling
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typo
1. a mistake in printed matter resulting from mechanical failures of some kind
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ammo
1. projectiles to be fired from a gun
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veto
1. a vote that blocks a decision
2. the power or right to prohibit or reject a proposed or intended act (especially the power of a chief executive to reject a bill passed by the legislature)
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camo
1. fabric dyed with splotches of green and brown and black and tan; intended to make the wearer of a garment made of this fabric hard to distinguish from the background
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locoMore Definitions →
hobo
1. a vagrant
2. a worker who moves around and works temporarily in different places
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lido
1. a recreational facility including a swimming pool for water sports
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milo
1. small drought-resistant sorghums having large yellow or whitish grains
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judo
1. a sport adapted from jujitsu (using principles of not resisting) and similar to wrestling; developed in Japan
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sumo
1. a Japanese form of wrestling; you lose if you are forced out of a small ring or if any part of your body (other than your feet) touches the ground
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ergoMore Definitions →
faro
1. a card game in which players bet against the dealer on the cards he will draw from a dealing box
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giro
1. a check given by the British government to someone who is unemployed; it can be cashed either at a bank or at the post office
2. a British financial system in which a bank or a post office transfers money from one account to another when they receive authorization to do so
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brio
1. quality of being active or spirited or alive and vigorous
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miro
1. New Zealand conifer used for lumber; the dark wood is used for interior carpentry
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arcoMore Definitions →
redoMore Definitions →
vino
1. fermented juice (of grapes especially)
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kilo
1. one thousand grams; the basic unit of mass adopted under the Systeme International d'Unites
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silo
1. a cylindrical tower used for storing silage
2. military installation consisting of an underground structure where ballistic missiles can be stored and fired
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capo
1. the head of a branch of an organized crime syndicate
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kino
1. a gum obtained from various tropical plants; used as an astringent and in tanning
2. East Indian tree yielding a resin or extract often used medicinally and in e.g. tanning
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coho
1. fatty pinkish flesh of small salmon caught in the Pacific and Great Lakes
2. small salmon of northern Pacific coasts and the Great Lakes
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gyro
1. a Greek sandwich: sliced roast lamb with onion and tomato stuffed into pita bread
2. rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction
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miso
1. a thick paste made from fermented soybeans and barley or rice malt; used in Japanese cooking to make soups or sauces
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hypo
1. a compound used as a fixing agent in photographic developing
2. a piston syringe that is fitted with a hypodermic needle for giving injections
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lino
1. a floor covering
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taro
1. edible starchy tuberous root of taro plants
2. herb of the Pacific islands grown throughout the tropics for its edible root and in temperate areas as an ornamental for its large glossy leaves
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mako
1. powerful mackerel shark of the Atlantic and Pacific
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sago
1. powdery starch from certain sago palms; used in Asia as a food thickener and textile stiffener
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dodo
1. someone whose style is out of fashion
2. extinct heavy flightless bird of Mauritius related to pigeons
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bolo
1. a cord fastened around the neck with an ornamental clasp and worn as a necktie
2. long heavy knife with a single edge; of Philippine origin
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dado
1. panel forming the lower part of an interior wall when it is finished differently from the rest of the wall
2. the section of a pedestal between the base and the surbase
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bozo
1. a man who is a stupid incompetent fool
2. an informal term for a youth or man
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koto
1. Japanese stringed instrument that resembles a zither; has a rectangular wooden sounding board and usually 13 silk strings that are plucked with the fingers
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ludo
1. a simple board game in which players move counters according to the throw of dice
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kayo
1. a blow that renders the opponent unconscious
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jiao
1. 10 jiao equal 1 yuan in China
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bufo
1. any toad of the genus Bufo
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fado
1. a sad Portuguese folksong
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tiro
1. someone new to a field or activity
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oleo
1. a spread made chiefly from vegetable oils and used as a substitute for butter
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wino
1. a chronic drinker
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4-Letter Nouns Ending With O