Countable Nouns That Start with O and End with TER

Explore 50 verified English countable nouns starting with O and ending with TER, including Outer, Oyster, Otter, Ouster, Orbiter, Outfitter and Oximeter. 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 OA
1 words
oater
Starts with OB
1 words
obiter
Starts with OC3 words
octocopter
occulter
octameter
Starts with OE
2 words
oedometer
oenometer
Starts with OF
1 words
offcutter
Starts with OH
1 words
ohmmeter
Starts with OL5 words
oldster
oleaster
olfactometer
oleorefractometer
oligochronometer
Starts with OM
2 words
ombrometer
omitter
Starts with ON
2 words
onsetter
oncometer
Starts with OP12 words
opter
optometer
ophthalmometer
opisometer
ophthalmodynamometer
ophthalmostatometer
ophthalmothermometer
ophiolater
opsiometer
ophthalmotonometer
ophthalmotropometer
ophthalmodiastimeter
Starts with OR6 words
orbiter
ornithopter
orthocenter
orienter
orthopter
orometer
Starts with OS
2 words
osmometer
ostreodynamometer
Starts with OT
1 words
otter
Starts with OU6 words
outer
ouster
outfitter
outputter
outvoter
outporter
Starts with OV
2 words
overnighter
overeater
Starts with OX
2 words
oximeter
oxter
Starts with OY
1 words
oyster

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