/ Thesaurus / M Synonyms of mules Find synonyms for: Noun1. mule, equine, equidusage: hybrid offspring of a male donkey and a female horse; usually sterile2. mule, scuff, slipper, carpet slipperusage: a slipper that has no fitting around the heelWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language