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5-Letter Words Starting with O

For puzzles requiring O prefixes, here are all 5-letter word options. Popular examples include OAKEN, OAKUM, OARED, plus OASES, OASIS, OASTS and many more. Click any word for its full definition and usage.

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182 words

Word	Length	Syllables
oaken	5	2
oakum	5	2
oared	5	2
oases	5	2
oasis	5	2
oasts	5	1
oaten	5	2
oater	5	2
oaths	5	1
oaves	5	2
obeah	5	2
obeli	5	3
obese	5	2
obeys	5	2
obias	5	2
obits	5	2
objet	5	2
oboes	5	2
obole	5	2
oboli	5	3
obols	5	2
occur	5	2
ocean	5	2
ocher	5	2
ochre	5	1
ochry	5	2
ocker	5	2
ocrea	5	2
octad	5	2
octal	5	2
octan	5	2
octet	5	2
octyl	5	2
oculi	5	3
odahs	5	2
odder	5	2
oddly	5	2
odeon	5	2
odeum	5	2
odist	5	2
odium	5	2
odors	5	2
odour	5	2
odyle	5	2
odyls	5	2
ofays	5	2
offal	5	2
offed	5	2
offer	5	2
often	5	2
ofter	5	2
ogams	5	2
ogees	5	2
ogham	5	2
ogive	5	2
ogled	5	2
ogler	5	2
ogles	5	2
ogres	5	2
ohias	5	2
ohing	5	2
ohmic	5	2
oidia	5	2
oiled	5	2
oiler	5	2
oinks	5	1
okapi	5	3
okays	5	2
okehs	5	2
okras	5	2
olden	5	2
older	5	2
oldie	5	1
oleic	5	2
olein	5	2
oleos	5	2
oleum	5	2
olios	5	2
olive	5	2
ollas	5	2
ology	5	3
omasa	5	3
omber	5	2
ombre	5	1
omega	5	3
omens	5	2
omers	5	2
omits	5	2
onery	5	3
onion	5	2
onium	5	2
onset	5	2
ontic	5	2
oohed	5	2
oomph	5	1
oorie	5	1
ootid	5	2
oozed	5	2
oozes	5	2
opahs	5	2
opals	5	2
opens	5	2
opera	5	3
opine	5	2
oping	5	2
opium	5	2
opsin	5	2
opted	5	2
optic	5	2
orach	5	2
orals	5	2
orang	5	2
orate	5	2
orbed	5	2
orbit	5	2
orcas	5	2
orcin	5	2
order	5	2
ordos	5	2
oread	5	2
organ	5	2
orgic	5	2
oribi	5	3
oriel	5	2
orles	5	2
orlop	5	2
ormer	5	2
ornis	5	2
orpin	5	2
orris	5	2
ortho	5	2
orzos	5	2
osier	5	2
osmic	5	2
osmol	5	2
ossia	5	2
ostia	5	2
other	5	2
ottar	5	2
otter	5	2
ottos	5	2
ought	5	1
ounce	5	1
ouphe	5	1
ouphs	5	1
ourie	5	1
ousel	5	2
ousts	5	1
outby	5	2
outdo	5	2
outed	5	2
outer	5	2
outgo	5	2
outre	5	1
ouzel	5	2
ouzos	5	2
ovals	5	2
ovary	5	3
ovate	5	2
ovens	5	2
overs	5	2
overt	5	2
ovine	5	2
ovoid	5	2
ovoli	5	3
ovolo	5	3
ovule	5	2
owing	5	2
owlet	5	2
owned	5	2
owner	5	2
owsen	5	2
oxbow	5	2
oxeye	5	1
oxide	5	2
oxids	5	2
oxime	5	2
oxims	5	2
oxlip	5	2
oxter	5	2
oyers	5	1
ozone	5	2

FAQs

Are O-starting words common?
O is a frequent start; probing vowel swaps after O quickly narrows options.

Is this list good for crosswords?
Yes—filter by length mentally and scan definitions when available.

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