Breadcrumb Home > Thesaurus > O Synonyms of old faithful Find synonyms for: Noun1. Old Faithfulusage: a geyser in Yellowstone National Park that erupts for about 4 minutes about every 65 minutesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: triumphalism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language