sand sage vs sagebrush

sand sage and sagebrush both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand sage	Yes	No	No	No
sagebrush	Yes	No	No	No

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

sand sage: silver-haired shrub of central and southern United States and Mexico; a troublesome weed on rangelands
sagebrush: any of several North American composite subshrubs of the genera Artemis or Seriphidium

Other hypernyms of sand sage include sage brush.

sand sage (noun)	sagebrush (noun)
silver-haired shrub of central and southern United States and Mexico; a troublesome weed on rangelands	any of several North American composite subshrubs of the genera Artemis or Seriphidium