puss vs kitty

puss and kitty both are nouns.

Word	Noun	Adjective	Verb	Adverb
puss	Yes	No	No	No
kitty	Yes	No	No	No

As nouns, puss and kitty are synonyms defined as:

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

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