| outback | (noun) the bush country of the interior of Australia | - |
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| outboard | (noun) internal-combustion engine that mounts at stern of small boat | Synonyms: outboard motor |
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| (noun) a motorboat with an outboard motor | Synonyms: outboard motorboat |
| outbreak | (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, irruption |
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| outbuilding | (noun) a building that is subordinate to and separate from a main building | - |
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| outburst | (noun) a sudden violent disturbance | Synonyms: tumultuous disturbance |
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| (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, effusion, gush |
| (noun) a sudden intense happening | Synonyms: burst, flare-up |