| Oa is for oath. |
| Ob is for objection, obstacle and object. |
| Oc is for october. |
| Od is for odor. |
| Of is for of course. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for olympic, old and old testament. |
| Om is for ominous. |
| On is for once more, on the other hand and on the one hand. |
| Op is for opium. |
| Or is for ordered, oriental and ordinary. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for outcome and oust. |
| Ov is for over(p), overlap and overhead. |
| Ow is for own. |
| Ox is for oxygen. |
| Oy is for oyabun. |
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