/ Thesaurus / S Synonyms of selective service system Find synonyms for: Noun1. Selective Service, Selective Service System, SSS, independent agencyusage: an independent federal agency that administers compulsory military serviceWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language