6
check into(verb, expression, phrasal verb)
6
enquire into
6
experiment(verb, study, check, taste, examine)
6
quiz(verb, study, check, correct, examine)
6
scrutinise
6
sound(verb, examine, seize, test, survey)
5
look at(verb, expression, phrasal verb, study, check)
5
analyze
5
case(verb, study, check, consider, correct)
5
check up(verb, expression, phrasal verb, study, check)
5
comb(verb, study, check, separate, consider)
5
contemplate(verb, study, check, consider, favor)
5
determine(verb, study, get, disease, observe)
5
dig into(verb, expression, study, check, separate)
5
follow up(verb, action, movement, follow, pursue)
5
poke(verb, study, check, examine, dig)
5
query(verb, get, dispute, provoke, examine)
5
ransack(verb, action, check, turn, follow)
5
read(verb, study, check, consider, observe)
5
reconnoiter(verb, study, check, consider, observe)
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APASmart Define. (2016). investigate thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/investigate/thesaurus/synonyms
ChicagoSmart Define. 2016. "investigate thesaurus" https://smartdefine.org/investigate/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, investigate thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/investigate/thesaurus/synonyms>.
MLASmart Define. "investigate thesaurus" 17 February 2016. Web. 27 September 2026. <https://smartdefine.org/investigate/thesaurus/synonyms>