137 entries under investigate topic. ×

4
root(verb, check, follow, examine, pursue)
4
search out(verb, expression, phrasal verb, determine, follow)
4
track down(verb, expression, phrasal verb, check, drive)
4
try to find(verb, expression, idiom, follow, examine)
3
catechize(verb, examine, challenge, request, question)
3
challenge(verb, go, promote, examine, exact)
3
delve for(verb, expression, phrasal verb, follow, pursue)
3
dig for(verb, expression, phrasal verb, follow, pursue)
3
ferret(verb, check, sound, examine, look)
3
gun for(verb, expression, phrasal verb, check, follow)
3
research(verb, action, study, examine, try)
3
scout(verb, check, follow, examine, try)
3
scratch(verb, work, determine, follow, strain)
3
study(verb, check, examine, request, question)
2
beat about(verb, expression, check, examine, look)
2
fan(verb, follow, pursue, look)
2
go over(verb, expression, examine, challenge)
2
go over with a fine-tooth comb(verb, expression, idiom, check, sound)
2
grill(verb, examine, challenge, request)
2
hit(verb, order, charge, examine, challenge)
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APASmart Define. (2016). seek thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/seek/thesaurus/synonyms
ChicagoSmart Define. 2016. "seek thesaurus" https://smartdefine.org/seek/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, seek thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/seek/thesaurus/synonyms>.
MLASmart Define. "seek thesaurus" 1 April 2016. Web. 30 September 2026. <https://smartdefine.org/seek/thesaurus/synonyms>