matchbush vs subshrub

matchbush and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
matchbush	Yes	No	No	No
subshrub	Yes	No	No	No

As nouns, subshrub is a hypernym of matchbush; that is, subshrub is a word with a broader meaning than matchbush:

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

Other hypernyms of matchbush include suffrutex.

matchbush (noun)	subshrub (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