/ Thesaurus / D Synonyms of diffuse nebula Find synonyms for: Noun1. diffuse nebula, gaseous nebula, nebulausage: a cluster of stars within an intricate cloud of gas and dustWordNet 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