/ Thesaurus / H Synonyms of horizontal surface Find synonyms for: Noun1. horizontal surface, level, surfaceusage: a flat surface at right angles to a plumb line; "park the car on the level"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language