Breadcrumb Home > Thesaurus > B Synonyms of boulder Find synonyms for: Noun 1. boulder, bowlder, rock, stone usage: a large smooth mass of rock detached from its place of origin 2. Boulder usage: a town in north central Colorado; Rocky Mountains resort center and university town WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of boulder (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: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language