/ Thesaurus / U Synonyms of undercover operation Find synonyms for: Noun1. undercover operation, operationusage: an operation involving secret work within a community or institutionWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language