119 entries under noun topic. ×
| reason(information, cause, start, reason) | |
| enigma(trouble, informal, challenge, question) | |
| ground(cause, start, reason, idea) | |
| mystery(trouble, difficulty, reason, informal) | |
| wherefore(adverb, information, cause, start) | |
| riddle(trouble, challenge, question, secret) | |
| mystification(trouble, challenge, question, secret) | |
| problem(trouble, challenge, question, secret) | |
| proof(cause, reason, informal, idea) | |
| puzzlement(trouble, challenge, question, secret) | |
| poser(trouble, difficulty, challenge, question) | |
| argument(information, cause, reason, idea) | |
| cause(start, reason, base, call) | |
| closed book(expression, trouble, challenge, question) | |
| explanation(cause, basis, justification, grounds) | |
| how(adverb, reason) | |
| rationale(cause, reason, idea, case) | |
| purpose(cause, consideration, purpose, basis) | |
| brain-teaser(trouble, challenge, puzzle) | |
| intention(cause, purpose, basis, planned) |
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| APA | Smart Define. (2016). why thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/why/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "why thesaurus" https://smartdefine.org/why/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, why thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/why/thesaurus/synonyms>. |
| MLA | Smart Define. "why thesaurus" 2 February 2016. Web. 25 September 2026. <https://smartdefine.org/why/thesaurus/synonyms> |