/ Thesaurus / S Synonyms of social security number Find synonyms for: Noun1. Social Security number, number, identification numberusage: the number of a particular individual's Social Security accountWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language