Investigation in Malayalam

Malayalam words whose English meaning includes “investigation”:

ഗവേഷണം (gaveshanam) — Research, investigation.
നിരൂപണം (niroopanam) — Criticism, review, investigation.
പൂരായം (poorayam) — Jocular talk, nonsense, falsehood, curiosity, probe, scrutiny, close investigation.
പ്രശ്നം (prashnam) — Question, problem, investigation, topic of discussion, enquiry, astrological calculation.
വിചാരണ (vichaarana) — Trial, examination (in a law court), enquiry, investigation.