/ Thesaurus / E Synonyms of efficiency apartment Find synonyms for: Noun1. efficiency apartment, apartment, flatusage: a furnished apartment with a kitchenette and bathroomWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language