red grouse vs moorgame

red grouse and moorgame both are nouns.

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

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

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

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

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