deer grass vs suffrutex

deer grass and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
deer grass	Yes	No	No	No
suffrutex	Yes	No	No	No

As nouns, suffrutex is a hypernym of deer grass; that is, suffrutex is a word with a broader meaning than deer grass:

deer grass: any of several plants of the genus Rhexia usually having pink-purple to magenta flowers; eastern North America
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of deer grass include subshrub.

deer grass (noun)	suffrutex (noun)
any of several plants of the genus Rhexia usually having pink-purple to magenta flowers; eastern North America	low-growing woody shrub or perennial with woody base