complain vs grouse

complain is not a noun while grouse is a noun.

Word	Noun	Adjective	Verb	Adverb
complain	No	No	Yes	No
grouse	Yes	No	Yes	No

As verbs, grouse is a hyponym of complain; that is, grouse is a word with a more specific, narrower meaning than complain:

complain (noun)	grouse (noun)
	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

complain (verb)	grouse (verb)
express complaints, discontent, displeasure, or unhappiness	complain
make a formal accusation; bring a formal charge	hunt grouse