/ Thesaurus / B Synonyms of boston lettuce Find synonyms for: Noun1. Boston lettuce, butterhead lettuceusage: lettuce with relatively soft leavesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language