| Oa is for oath. |
| Ob is for obviously. |
| Oc is for occasionally, occasionally and occasional(a). |
| Od is for odd. |
| Of is for off, offer and off. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for olympic, old and old(a). |
| Om is for ominous. |
| On is for on it, onset and on hand(p). |
| Op is for operational, opposite and opinion. |
| Or is for ordering. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outlook and out. |
| Ov is for oval. |
| Ow is for own(a). |
| Ox is for oxygen. |
| Oy is for oyabun. |
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