red grouse vs Lagopus scoticus

red grouse and Lagopus scoticus both are nouns.

Word	Noun	Adjective	Verb	Adverb
red grouse	Yes	No	No	No
Lagopus scoticus	Yes	No	No	No

As nouns, red grouse and Lagopus scoticus are synonyms defined as:

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

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

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