| Oa is for oak apple. |
| Ob is for oboe, object code and obsolescent. |
| Oc is for oct, octane number and oculomotor. |
| Od is for odometer and odourise. |
| Oe is for oenothera fruticosa and oedogonium. |
| Of is for off-season, officiation and offerer. |
| Og is for ogre. |
| Oh is for ohm's law and ohio goldenrod. |
| Oi is for oil pump, oil slick and oireachtas. |
| Oj is for ojibway. |
| Ok is for okra plant. |
| Ol is for older, olympian games and olivine. |
| Om is for omega-6 and omotic. |
| On is for one hundred. |
| Oo is for oosphere, oomycetes and oodles. |
| Op is for optic and oppositely. |
| Or is for orthomyxovirus and orthotomus. |
| Os is for ostler. |
| Ot is for otter. |
| Ou is for out of doors and outgoer. |
| Ov is for overt and overcloud. |
| Ow is for owlishly and owlt. |
| Ox is for oxheart cherry. |
| Oy is for oyster cracker. |
| Oz is for ozone hole, ozone layer and ozocerite. |
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