/ Thesaurus / L Synonyms of lead line Find synonyms for: Noun1. lead line, sounding line, plumb line, perpendicularusage: (nautical) plumb line for determining depthWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: imprudent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language