Breadcrumb Home > Thesaurus > S Synonyms of sustainer Find synonyms for: Noun 1. upholder, maintainer, sustainer, supporter, protagonist, champion, admirer, booster, friend usage: someone who upholds or maintains; "firm upholders of tradition"; "they are sustainers of the idea of democracy" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sustainer (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: irascible Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language