| loon | (noun) large somewhat primitive fish-eating diving bird of the Northern Hemisphere having webbed feet placed far back; related to the grebes | Synonyms: diver |
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| (noun) a worthless lazy fellow | - |
| (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, addlehead, birdbrain |
| looney | (noun) someone deranged and possibly dangerous | Synonyms: crazy, loony, nutcase, weirdo |
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| loonie | (noun) the basic unit of money in Canada | Synonyms: Canadian dollar |
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| loony | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loopy, nuts, nutty, round the bend, wacky, whacky |
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| (noun) someone deranged and possibly dangerous | Synonyms: crazy, looney, nutcase, weirdo |