kitty-cat vs kitty

kitty-cat and kitty both are nouns.

Word	Noun	Adjective	Verb	Adverb
kitty-cat	Yes	No	No	No
kitty	Yes	No	No	No

As nouns, kitty-cat and kitty are synonyms defined as:

Other synonyms of kitty-cat include puss, pussy, pussycat.

kitty-cat (noun)	kitty (noun)
informal terms referring to a domestic cat	informal terms referring to a domestic cat
	young domestic cat
	the combined stakes of the betters
	the cumulative amount involved in a game (such as poker)