Breadcrumb Home > Thesaurus Cite Synonyms of impost Find synonyms for: Noun1. customs, customs duty, custom, impost, duty, tariffusage: money collected under a tariff2. springer, impost, stoneusage: the lowest stone in an arch -- from which it springsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: impost (Dictionary) Related Content Daily Word Quiz: persiflage Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index