grouse-berry vs blueberry bush

grouse-berry and blueberry bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
grouse-berry	Yes	No	No	No
blueberry bush	Yes	No	No	No

As nouns, blueberry bush is a hypernym of grouse-berry; that is, blueberry bush is a word with a broader meaning than grouse-berry:

grouse-berry: shrub of northwestern North America bearing red berries
blueberry bush: any of numerous shrubs of the genus Vaccinium bearing blueberries

Other hypernyms of grouse-berry include blueberry.

grouse-berry (noun)	blueberry bush (noun)
shrub of northwestern North America bearing red berries	any of numerous shrubs of the genus Vaccinium bearing blueberries