8
check(noun, study, measure, review, struggle)
7
trial(noun, study, check, measure, review)
7
experiment(noun, study, check, review, struggle)
7
observation(noun, study, check, measure, review)
6
probing(noun, study, check, review, approval)
6
questioning(noun, study, check, concern, interest)
5
discussion(study, notice, judgment, examination, trial)
5
investigating
5
quiz(noun, study, check, measure, review)
4
assay(noun, study, check, measure, review)
4
audit(noun, study, check, review, search)
4
delving(noun, study, check, review, search)
4
detection(noun, review, conclusion, inspection, scrutiny)
4
hearing(noun, study, check, review, search)
4
proof(noun, study, check, measure, struggle)
4
sounding(noun, check)
4
surveying(noun, check)
3
anatomy(noun, study)
3
canvass(study, check, notice, judgment, test)
3
consideration(noun, study, check, class, exercise)
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APASmart Define. (2015). investigation thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/investigation/thesaurus/synonyms
ChicagoSmart Define. 2015. "investigation thesaurus" https://smartdefine.org/investigation/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, investigation thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/investigation/thesaurus/synonyms>.
MLASmart Define. "investigation thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/investigation/thesaurus/synonyms>