red grouse vs moorcock

red grouse and moorcock both are nouns.

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

As nouns, moorcock is a hyponym of red grouse; that is, moorcock is a word with a more specific, narrower meaning than red grouse:

Other hyponyms of red grouse include moorhen.

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