13 letter nouns that start with O

Did you know that nouns are the most common class of words in the English language? Nouns have a broader definition, but in simple terms, a noun is a word that identifies a person, place, thing, or idea.

Since we are focusing on 13-letter nouns starting with O in this list, below are some examples of nouns from the context of the list.

1. Objectiveness
2. Oceanographer
3. Odontoglossum
4. Offensiveness
5. Oleomargarine
6. Oneiroscopist
7. Ophthalmology
8. Orchestration
9. Osteomyelitis
10. Outspokenness

Based on the use, nouns can be categorized as common nouns, proper nouns, countable, uncountable, etc.

We hope these small tips about nouns helped you improve your language knowledge while you enjoy our below list of 71 13-letter nouns that start with O

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