3
dissection(noun, study, check, examination, test)
3
experimentation(noun, study, measure, struggle, examination)
3
hunt(noun, search, examination, chase, mission)
3
indagation
3
legwork(noun, study, check, cheat, speed)
3
observing(noun, study, check, search, examination)
3
sifting(noun, study, review, search, examination)
3
verification(noun, study, check, measure, review)
2
appraisal(noun, study, change, check, notice)
2
blue book(noun, expression, study, check, review)
2
case(noun, check)
2
check out
2
conference(trial, inquiry)
2
cross-examination(noun, study, check, review, judgment)
2
debate(noun, study, class, exercise, subject)
2
deliberation(noun, study, class, exercise, subject)
2
diagnosis(noun, study, check, disease, review)
2
disquisition(review, autopsy)
2
evaluation(noun, study, change, check, notice)
2
exam(noun, study, check, review, approval)
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APASmart Define. (2015). investigation thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/investigation/thesaurus/synonyms
ChicagoSmart Define. 2015. "investigation thesaurus" https://smartdefine.org/investigation/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, investigation thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/investigation/thesaurus/synonyms>.
MLASmart Define. "investigation thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/investigation/thesaurus/synonyms>