/ Thesaurus / S Synonyms of security department Find synonyms for: Noun1. security, security department, department, sectionusage: a department responsible for the security of the institution's property and workers; "the head of security was a former policeman"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: torrid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language