gray catbird vs catbird

gray catbird and catbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
gray catbird	Yes	No	No	No
catbird	Yes	No	No	No

As nouns, gray catbird and catbird are synonyms defined as:

gray catbird and catbird: North American songbird whose call resembles a cat's mewing

Other synonyms of gray catbird include Dumetella carolinensis, grey catbird.

gray catbird (noun)	catbird (noun)
North American songbird whose call resembles a cat's mewing	North American songbird whose call resembles a cat's mewing
	any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females