Breadcrumb Home > Thesaurus > P Synonyms of plainsong Find synonyms for: Noun1. plainsong, plainchant, Gregorian chant, chantusage: a liturgical chant of the Roman Catholic ChurchWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of plainsong (Dictionary) ✖ Related Content Daily Word Quiz: temporize Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language