/ Thesaurus / S Synonyms of sleeper cell Find synonyms for: Noun1. sleeper cell, cell, cadreusage: a cell of sleepers; "an al-Qaeda sleeper cell may have used Arizona as its base"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language