/ Thesaurus / L Synonyms of lock nut Find synonyms for: Noun1. locknut, safety nut, nutusage: supplementary nut that is screwed down on a primary nut to prevent it from looseningWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language