338 entries under noun topic. ×

38
examination(study, check, measure, review)
33
exploration(study, check, review, search)
31
study(change, check, notice, measure)
29
research(study, check, measure, review)
27
scrutiny(study, check, measure, review)
25
probe(study, check, measure, review)
24
analysis(study, change, check, notice)
23
reconnaissance(study, search, test, investigate)
22
inspection(study, change, check, notice)
22
inquiry(study, check, review, division)
21
inquest(study, check, review, request)
17
enquiry
16
search(study, check, measure, review)
15
inquisition(study, check, review, test)
13
survey(study, check, review, class)
13
review(study, change, check, class)
12
test(study, check, measure, review)
10
interrogation(study, test, race, analysis)
8
curiosity(regard, concern, interest, understand)
8
quest(study, check, search, test)
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APASmart Define. (2015). investigation thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/investigation/thesaurus/synonyms
ChicagoSmart Define. 2015. "investigation thesaurus" https://smartdefine.org/investigation/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, investigation thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/investigation/thesaurus/synonyms>.
MLASmart Define. "investigation thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/investigation/thesaurus/synonyms>