grouse whortleberry vs grouseberry

grouse whortleberry and grouseberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
grouse whortleberry	Yes	No	No	No
grouseberry	Yes	No	No	No

As nouns, grouse whortleberry and grouseberry are synonyms defined as:

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

Other synonyms of grouse whortleberry include grouse-berry, Vaccinium scoparium.

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