moorbird vs red grouse

moorbird and red grouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
moorbird	Yes	No	No	No
red grouse	Yes	No	No	No

As nouns, moorbird and red grouse are synonyms defined as:

moorbird and red grouse: reddish-brown grouse of upland moors of Great Britain

Other synonyms of moorbird include Lagopus scoticus, moor-bird, moorfowl, moorgame.

moorbird (noun)	red grouse (noun)
reddish-brown grouse of upland moors of Great Britain	reddish-brown grouse of upland moors of Great Britain