| Oa is for oath. |
| Ob is for obey, objection and objective. |
| Oc is for occupational. |
| Od is for odd. |
| Of is for of course and of age(p). |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for old woman. |
| Om is for omit. |
| On is for one by one, one and the same(p) and on. |
| Op is for opinion. |
| Or is for organic. |
| Os is for ossification. |
| Ot is for other. |
| Ou is for outset and outside. |
| Ov is for overlook. |
| Ow is for own(a). |
| Ox is for oxide. |
| Oy is for oyabun. |
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