/ Thesaurus / F Synonyms of fountain grass Find synonyms for: Noun1. fountain grass, Pennisetum ruppelii, Pennisetum setaceum, grassusage: tall perennial ornamental grass with long nodding flower plumes of tropical Africa and AsiaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language