/ Thesaurus / K Synonyms of knotgrass Find synonyms for: Noun1. knotgrass, Paspalum distichum, grassusage: low-growing weedy grass with spikelets along the leaf stemsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pudgy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language