Countable Nouns That Start with O and End with IA

Explore 23 verified English countable nouns starting with O and ending with IA, including Onomatopoeia, Osteria, Ophidiophobia, Ossia, Ohia, Opuntia and Osmophobia. Sort these count nouns with singular and plural forms by word length for ESL grammar practice, determiner usage, and plural spelling below, or review singular and plural count rules in our noun grammar guide.

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Starts with OB
1 words
obelia
Starts with OD
2 words
odontalgia
odontophobia
Starts with OH
1 words
ohia
Starts with OL
2 words
olearia
olfactophobia
Starts with ON3 words
onomatopoeia
onychia
oneirodynia
Starts with OP5 words
ophidiophobia
opuntia
ophthalmoplegia
ophthalmophobia
ophthalmorrhagia
Starts with OR
2 words
orgia
ornithophobia
Starts with OS5 words
osteria
ostia
ossia
osmophobia
ostrowskia
Starts with OT
1 words
otalgia
Starts with OU
1 words
ourisia

•Browse Countable Nouns by Letter (A to Z)

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