/ Thesaurus / L Synonyms of lubricating oil Find synonyms for: Noun1. grease, lubricating oil, oilusage: a thick fatty oil (especially one used to lubricate machinery)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language