/ Thesaurus / O Synonyms of oil filter Find synonyms for: Noun1. oil filter, filterusage: a filter that removes impurities from the oil used to lubricate an internal-combustion engineWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language