140 entries under challenge topic. ×

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bugaboo(noun, question, puzzle, example)
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bump heads(verb, expression, question, contest)
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clash(verb, question, contest, impugn)
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cliff-hanger(noun, question, puzzle, example)
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confute(verb, question, contest, impugn)
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contend(verb, question, contest, impugn)
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contradict(verb, dispute, doubt, question)
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controvert(verb, oppose, dispute, doubt)
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deny(verb, dispute, doubt, question)
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disaffirm(verb, dispute, doubt, question)
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discept(verb, question, contest, impugn)
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discuss(verb, question, contest, impugn)
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disprove(verb, question, contest, impugn)
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gainsay(verb, dispute, doubt, question)
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grabber(noun, doubt, question, uncertainty)
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hassle(verb, question, contest, impugn)
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have at(verb, expression, question, contest)
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illustration(noun, question, puzzle, example)
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intricacy(noun, question, puzzle, example)
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kick around(verb, expression, question, contest)
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APASmart Define. (2016). query thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/query/thesaurus/synonyms
ChicagoSmart Define. 2016. "query thesaurus" https://smartdefine.org/query/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, query thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/query/thesaurus/synonyms>.
MLASmart Define. "query thesaurus" 17 February 2016. Web. 22 September 2026. <https://smartdefine.org/query/thesaurus/synonyms>