chat vs tittle-tattle

chat and tittle-tattle both are nouns.

Word	Noun	Adjective	Verb	Adverb
chat	Yes	No	Yes	No
tittle-tattle	Yes	No	Yes	No

As nouns, tittle-tattle is a hyponym of chat; that is, tittle-tattle is a word with a more specific, narrower meaning than chat:

chat (noun)	tittle-tattle (noun)
songbirds having a chattering call	light informal conversation for social occasions
birds having a chattering call
an informal conversation

chat (verb)	tittle-tattle (verb)
talk socially without exchanging too much information	speak (about unimportant matters) rapidly and incessantly