/ Thesaurus / M Synonyms of manhole cover Find synonyms for: Noun1. manhole cover, top, coverusage: a flush iron cover for a manhole (as in a street)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language