/ Thesaurus / S Synonyms of swallow hole Find synonyms for: Noun1. sinkhole, sink, swallow hole, natural depression, depressionusage: a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roofWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: torrid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language