/ Thesaurus / S Synonyms of sea cucumber Find synonyms for: Noun1. sea cucumber, holothurian, echinodermusage: echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feedersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language