| obey | orate |
| obfuscate | ordain |
| object | order |
| objectify | organize |
| oblige | orientate |
| obliterate | originate |
| obscure | oscillate |
| observe | oust |
| obsess | outbid |
| obstruct | outgrow |
| obtain | outlast |
| obviate | outlaw |
| occupy | outline |
| occur | outshine |
| offend | outwit |
| offer | overact |
| officiate | overburden |
| ogle | overcast |
| oil | overcome |
| omit | overdo |
| ooze | overfeed |
| open | overflow |
| operate | overhang |
| oppose | overlap |
| oppress | overpower |
| overrun |
| oversee |
| overshadow |
| overtake |
| overthrow |
| overturn |
| overwhelm |
| overwork |
| ovulate |
| owe |
| own |
| oxidize |
| oxygenate |
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