grouseberry vs grouse-berry

grouseberry and grouse-berry both are nouns.

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

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

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

Other synonyms of grouseberry include grouse whortleberry, Vaccinium scoparium.

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