matchweed vs suffrutex

matchweed and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
matchweed	Yes	No	No	No
suffrutex	Yes	No	No	No

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

matchweed: any of several plants of the genus Gutierrezia having tiny flower heads that resemble the heads of matches
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of matchweed include subshrub.

matchweed (noun)	suffrutex (noun)
any of several plants of the genus Gutierrezia having tiny flower heads that resemble the heads of matches	low-growing woody shrub or perennial with woody base