Breadcrumb Home > Thesaurus > P Synonyms of police investigation Find synonyms for: Noun1. police work, police investigation, investigation, investigatingusage: the investigation of criminal activitiesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: solecism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language