Definition |
Category |
| Of | Miscellaneous |
| Out | Sports |
| Online | Networking |
| Office | FBI Files |
| Off | Electronics |
| October | Months Abbreviations |
| Object | General Computing |
| Operating | Electronics |
| Organization | General Business |
| Output | Software |
| Opportunities | Occupation & Positions |
| Opening | Physiology |
| Ohio | Regional |
| Officer | Military |
| Operations | General Business |
| Observation | Physiology |
| Observed | Food & Nutrition |
| Outdoor | Sports |
| Opportunity | General Business |
| Operator | Telecom |
| Oxygen | Chemistry |
| Optional | Military |
| Objectives | Military |
| Only | Miscellaneous |
| One | Miscellaneous |
| Outstanding | Military |
| Offset | News & Media |
| Operate | Products |
| Old | Marketing |
| Ownership | Stock Exchange |
| Outdoors | Regional |
| Open | Hardware |
| Original | Hobbies |
| Others | Miscellaneous |
| Offer | Investments |
| Oh | Chat |
| Often | Miscellaneous |
| Owner | Miscellaneous |
| Orange | Colors |
| Oldest | Community |
| Oliver | Names and Nicknames |
| Oakland | State & Local |
| Optimization | Miscellaneous |
| Ongoing | Healthcare |
| Odds | Statistics |
| Ordinary | Miscellaneous |
| Orchestra | Music |
| Oasis | Regional |
| Outcomes | Laboratory |
| Overclocking | General Computing |
| Owen | Names and Nicknames |
| Oben | German |
| Oprah | Famous & Celebs |
| Omaha | State & Local |
| Outreach | Marketing |
| Olympics | Sports |
| Outer | Products |
| Omni | Latin |
| Onset | Physiology |
| Ordentlich | German |
| Osten | German |
| Ola | Names and Nicknames |
| Overlay | Occupation & Positions |
| Obedience | Law & Legal |
| Optimism | Community |
| Overt | US Government |
| Orifice | Physiology |
| Obedient | Law & Legal |
| Osteoarthritis | Physiology |
| Oldenburg | Travel & Tourism |
| Oddity | Funnies |
| Organism | Biology |
| Ohm | Physics |
| Odor | Chemistry |
| Odin | Academic & Science |
| Odd | Mathematics |
| Outrageous | Psychology |
| Occult | Astronomy |
| Oblivion | Astronomy |
| Oort | NASA |
| Octopus | Food & Nutrition |
| Occlude | Physiology |
| Overs | Music |
| Oatmeal | Food & Nutrition |
| Overcooked | Food & Nutrition |
| Octant | Mathematics |
| Ostrich | Veterinary |
| Outpouring | Miscellaneous |
| Oriundo | Spanish |
| Ossie | Names and Nicknames |
| Omologato | Italian |
| Obliqueness | Mathematics |
| Realty Income Corporation | NYSE Symbols |
| Occipito | Physiology |
| Onions | Food & Nutrition |
| Ovangkol | Botany |
| Oplegger | Dutch |
| Oluolu | Companies & Firms |
| Overdistance | Miscellaneous |
| UNIX Object file | File Extensions |
| Official | Governmental |
| pint | Prescription |
| Ottawa | Regional |
| Hug | Emoticons |
| Omicron | NASA |
| Originality | Miscellaneous |
| Overhaul | Miscellaneous |
| New Orleans, Louisiana (mint mark on US coins) | Coins |
| Order | Food & Nutrition |
| Outcome | Statistics |
| Outside | Colors |
| Over | Accounting |
| Contour Pattern | Military |
| form O solenoid (actuator Only, no contacts) | Electronics |
| Obesity | Diseases |
| Obvious | Hospitals |
| Omega | NASA |
| Orophus | Healthcare |
| Ost | German |
| Overall impression | Medical |
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