15-Letter Nouns Starting With O
Here's the list of all the 136 15-Letter Nouns Starting 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) | |
|---|---|
| oligonucleotide | 1. (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides More Definitions → |
| ophthalmologist | 1. a medical doctor specializing in the diagnosis and treatment of diseases of the eye More Definitions → |
| organophosphate | 1. an insecticide that interferes with an insect's nervous system More Definitions → |
| More Common Nouns → | |