| Oa is for oak-leaved goosefoot and oarsman. |
| Ob is for object glass. |
| Oc is for octagonal. |
| Od is for oddity and odonate. |
| Oe is for oedogonium. |
| Of is for off-the-clock, of course and offhanded. |
| Og is for ogler and ogle. |
| Oh is for ohmic. |
| Oi is for oilfield and oil stain. |
| Oj is for ojos del salado. |
| Ok is for okey. |
| Ol is for old latin and oligodactyly. |
| Om is for omissible and omega-3. |
| On is for ononis repens and onchocerciasis. |
| Oo is for ooze leather and ooze. |
| Op is for operator gene, ophioglossum and opsonize. |
| Or is for orzo, oread and order myricales. |
| Os is for os trapezium. |
| Ot is for ottorino respighi, othello and othonna. |
| Ou is for outrival and outdoor man. |
| Ov is for overwrite and over here. |
| Ow is for owensboro and ownerless. |
| Ox is for oxyura jamaicensis and oxyuranus scutellatus. |
| Oy is for oyster agaric and oyster plant. |
| Oz is for ozena. |
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