| crack-skull(noun, slang, sick, mad person) | |
| crackbrain | |
| crane(noun, bird) | |
| crazy person(expression, idiom, patient, cuckoo, lunatic) | |
| crow(noun, bird) | |
| cub | |
| cullion | |
| cur | |
| curlew(noun, bird) | |
| curmudgeon | |
| deranged person(noun, expression, fanatic, crackpot, dingbat) | |
| diving bird | |
| dodo(noun, bird) | |
| doodle | |
| dove(noun, bird) | |
| duck(noun, bird) | |
| dumb cluck | |
| dumb ox(expression, simple, fool, innocent, jerk) | |
| dunderhead(simple, fool, innocent, jerk, clown) | |
| eagle(noun, bird) |
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| APA | Smart Define. (2016). loon thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/loon/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "loon thesaurus" https://smartdefine.org/loon/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, loon thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/loon/thesaurus/synonyms>. |
| MLA | Smart Define. "loon thesaurus" 29 February 2016. Web. 22 September 2026. <https://smartdefine.org/loon/thesaurus/synonyms> |