tabby cat vs tabby

tabby cat and tabby both are nouns.

Word	Noun	Adjective	Verb	Adverb
tabby cat	Yes	No	No	No
tabby	Yes	Yes	No	No

As nouns, tabby cat and tabby are synonyms defined as:

tabby cat (noun)	tabby (noun)
a cat with a grey or tawny coat mottled with black	a cat with a grey or tawny coat mottled with black
	female cat

tabby cat (adjective)	tabby (adjective)
	having a grey or brown streak or a pattern or a patchy coloring; used especially of the patterned fur of cats