| Oa is for oath. |
| Ob is for obstacle and objective. |
| Oc is for occasionally. |
| Od is for odor. |
| Of is for offer. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for olympic, old man and old testament. |
| Om is for omit. |
| On is for once and one by one. |
| Op is for openly, opium and oppose. |
| Or is for or else and ordering. |
| Os is for ossification. |
| Ot is for other. |
| Ou is for out, outdoor(a) and oust. |
| Ov is for overcome, overcome and overwhelming. |
| Ow is for ownership. |
| Ox is for oxide. |
| Oy is for oyabun. |
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