heathfowl vs European black grouse

heathfowl and European black grouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
heathfowl	Yes	No	No	No
European black grouse	Yes	No	No	No

As nouns, heathfowl and European black grouse are synonyms defined as:

heathfowl and European black grouse: large northern European grouse that is black with a lyre-shaped tail

Other synonyms of heathfowl include Lyrurus tetrix.

heathfowl (noun)	European black grouse (noun)
large northern European grouse that is black with a lyre-shaped tail	large northern European grouse that is black with a lyre-shaped tail