/ Thesaurus / N Synonyms of niff Find synonyms for: Noun1. niff, pong, malodor, malodour, stench, stink, reek, fetor, foetor, mephitisusage: an unpleasant smellWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language