partridge vs ruffed grouse

partridge and ruffed grouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
partridge	Yes	No	No	No
ruffed grouse	Yes	No	No	No

As nouns, partridge and ruffed grouse are synonyms defined as:

partridge and ruffed grouse: valued as a game bird in eastern United States and Canada

Other synonyms of partridge include Bonasa umbellus.

partridge (noun)	ruffed grouse (noun)
small Old World gallinaceous game birds	valued as a game bird in eastern United States and Canada
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