grouse whortleberry vs grouse-berry

grouse whortleberry and grouse-berry both are nouns.

Word	Noun	Adjective	Verb	Adverb
grouse whortleberry	Yes	No	No	No
grouse-berry	Yes	No	No	No

As nouns, grouse whortleberry and grouse-berry are synonyms defined as:

grouse whortleberry and grouse-berry: shrub of northwestern North America bearing red berries

Other synonyms of grouse whortleberry include grouseberry, Vaccinium scoparium.

grouse whortleberry (noun)	grouse-berry (noun)
shrub of northwestern North America bearing red berries	shrub of northwestern North America bearing red berries