| Oa is for oath. |
| Ob is for obey. |
| Oc is for occupation and occur. |
| Od is for odd. |
| Of is for offset, often and off. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for olympic. |
| Om is for ominous. |
| On is for one-third, one and the same(p) and on the contrary. |
| Op is for optimum and operate. |
| Or is for oriented and or else. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for output. |
| Ov is for over(p). |
| Ow is for owner. |
| Ox is for oxen. |
| Oy is for oyabun. |
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