sharp-tailed grouse vs grouse

sharp-tailed grouse and grouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharp-tailed grouse	Yes	No	No	No
grouse	Yes	No	Yes	No

As nouns, grouse is a hypernym of sharp-tailed grouse; that is, grouse is a word with a broader meaning than sharp-tailed grouse:

sharp-tailed grouse: large grouse of prairies and open forests of western North America
grouse: popular game bird having a plump body and feathered legs and feet

sharp-tailed grouse (noun)	grouse (noun)
large grouse of prairies and open forests of western North America	popular game bird having a plump body and feathered legs and feet
	flesh of any of various grouse of the family Tetraonidae; usually roasted; flesh too dry to broil

sharp-tailed grouse (verb)	grouse (verb)
	complain
	hunt grouse