/ Thesaurus / S Synonyms of sac fungus Find synonyms for: Noun1. sac fungus, fungususage: any of various ascomycetous fungi in which the spores are formed in a sac or ascusWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language