14 Letter Countable Nouns Starting with O

Browse 40 valid English 14 letter countable nouns that start with O, from Obstructionist, Overcorrection, Overproduction, Outperformance, Overindulgence, Overestimation and Overcommitment to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review singular and plural count rules.

Refine list...
JUMP:
Sort:
Group:
Case:
View:
JUMP TO:
Select any word to view available definitions & photosSelect any word for details
Starts with OB
1 words
obstructionist
Starts with OC
1 words
octingentenary
Starts with ON
2 words
onomatopoiesis
oncogeneticist
Starts with OP7 words
ophthalmoscope
ophthalmoscopy
operationalist
ophthalmometer
ophthalmometry
opsonification
opisthocoelian
Starts with OR6 words
orthophosphate
organometallic
organochlorine
orthomyxovirus
orbitosphenoid
organographist
Starts with OS
2 words
osteoarthritic
osteoarthrosis
Starts with OU
1 words
outperformance
Starts with OV19 words
overcorrection
overproduction
overindulgence
overestimation
overcommitment
overregulation
overmedication
overinvestment
overgenerosity
overprediction
overdecoration
overadjustment
overassessment
overextraction
overevaluation
oversimplicity
overrefinement
overpersuasion
overproportion
Starts with OX
1 words
oxidoreductase

•Browse Countable Nouns by Letter (A to Z)

Select a starting letter to browse countable nouns
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Built for writers, students, and competitive word game players, Wordmom combines an uncluttered English dictionary and thesaurus with fast, pattern-based word finders so you can verify definitions, synonyms, and high-scoring tile plays in one place.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWordsVocabulary HubPositive WordsNegative Words
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A. and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. Words With Friends® is a registered trademark of Zynga Inc. Wordle® is a registered trademark of The New York Times Company. Other referenced game titles and tournament lexicon codes (including NASPA NWL and WESPA/HarperCollins CSW) are trademarks of their respective owners. Wordmom is an independent reference utility for educational and entertainment purposes and is not affiliated with, sponsored by, or endorsed by Hasbro, Mattel, Spear, Zynga, The New York Times Company, NASPA, WESPA, or HarperCollins Publishers. All game names are referenced strictly under nominative fair use to indicate compatibility.