sage brush vs subshrub

sage brush and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
sage brush	Yes	No	No	No
subshrub	Yes	No	No	No

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

sage brush: any of several North American composite subshrubs of the genera Artemis or Seriphidium
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of sage brush include suffrutex.

sage brush (noun)	subshrub (noun)
any of several North American composite subshrubs of the genera Artemis or Seriphidium	low-growing woody shrub or perennial with woody base