grey partridge vs partridge

grey partridge and partridge both are nouns.

Word	Noun	Adjective	Verb	Adverb
grey partridge	Yes	No	No	No
partridge	Yes	No	No	No

As nouns, partridge is a hypernym of grey partridge; that is, partridge is a word with a broader meaning than grey partridge:

grey partridge (noun)	partridge (noun)
common European partridge	small Old World gallinaceous game birds
	a popular North American game bird; named for its call
	valued as a game bird in eastern United States and Canada
	heavy-bodied small-winged South American game bird resembling a gallinaceous bird but related to the ratite birds
	flesh of either quail or grouse