/ Thesaurus / F Synonyms of fthm Find synonyms for: Noun1. fathom, fthm, linear unit, linear measureusage: a linear unit of measurement (equal to 6 feet) for water depth2. fathom, fthm, volume unit, capacity unit, capacity measure, cubage unit, cubic measure, cubic content unit, displacement unit, cubature unitusage: (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of oreWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language