| Oa is for oar and oarsmanship. |
| Ob is for obsessiveness and object-oriented database. |
| Oc is for octosyllable and oculist. |
| Od is for odometer and oddly enough. |
| Oe is for oestrogen. |
| Of is for offside and off-and-on(a). |
| Og is for ogre, ogee arch and ogcocephalidae. |
| Oh is for ohmage. |
| Oi is for oil stain and ois. |
| Oj is for ojos del salado. |
| Ok is for oken, okenfuss and oken. |
| Ol is for olive and old man. |
| Om is for omelet pan. |
| On is for ondatra. |
| Oo is for oomycetes. |
| Op is for opaline and optic axis. |
| Or is for orphrey, organelle and order radiolaria. |
| Os is for osborne and os frontale. |
| Ot is for ottoman and ottoman dynasty. |
| Ou is for ouster, out of stock(p) and outdoorsy. |
| Ov is for oval window and overlie. |
| Ow is for owlet moth and owlet. |
| Ox is for oxbow lake, ox-eyed and oxybutyric acid. |
| Oy is for oyster bank and oysters rockefeller. |
| Oz is for ozocerite, oz. and oz.. |
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