| Oa is for oath. |
| Ob is for obstruction. |
| Oc is for occupational, occasional(a) and occupant. |
| Od is for odd. |
| Of is for offset, officiate and officer. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old maid and old testament. |
| Om is for omit. |
| On is for one and the same(p), on the whole and one hundred. |
| Op is for optical and open. |
| Or is for organized and or else. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outfit, outcome and oust. |
| Ov is for overcast. |
| Ow is for own. |
| Ox is for oxidation. |
| Oy is for oyabun. |
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