sagebrush vs subshrub

sagebrush and subshrub both are nouns.

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

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

sagebrush: 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 sagebrush include suffrutex.

sagebrush (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