/ Thesaurus / M Synonyms of mergus merganser americanus Find synonyms for: Noun1. American merganser, Mergus merganser americanus, merganser, fish duck, sawbill, sheldrakeusage: common North American diving duck considered a variety of the European goosanderWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language