/ Thesaurus / C Synonyms of caulking Find synonyms for: Noun1. caulk, caulking, sealant, sealerusage: a waterproof filler and sealant that is used in building and repair to make watertightVerb1. caulk, calk, seal, seal offusage: seal with caulking; "caulk the window"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language