/ Thesaurus / J Synonyms of jackknife fish Find synonyms for: Noun1. jackknife-fish, Equetus lanceolatus, drum, drumfishusage: black-and-white drumfish with an erect elongated dorsal finWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language