| Oa is for oath, oafish and oak fern. |
| Ob is for observance, obscureness and obelisk. |
| Oc is for octane, oculopharyngeal muscular dystrophy and occupational therapy. |
| Od is for odesa, odovacar and odets. |
| Oe is for oestrus ovis. |
| Of is for off your guard, off the hook(p) and of your own. |
| Og is for oglala. |
| Oh is for ohio buckeye, ohm's law and ohmmeter. |
| Oi is for oil painter. |
| Oj is for ojibway. |
| Ok is for oktoberfest. |
| Ol is for old times. |
| Om is for omental bursa. |
| On is for one-eyed, onstage and one-person(a). |
| Oo is for ooze out, ooze leather and oort. |
| Op is for opera star and oporto. |
| Or is for orange hawkweed, orache and orthopteran. |
| Os is for osmunda regalis and ostreidae. |
| Ot is for otus scops. |
| Ou is for outsole, out of view and outgrow. |
| Ov is for overnight case and oviform. |
| Ow is for ownerless. |
| Ox is for oxtongue. |
| Oy is for oyster fish, oyster plant and oyster-fish. |
| Oz is for ozothamnus. |
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