talking vs chatter

talking and chatter both are nouns.

Word	Noun	Adjective	Verb	Adverb
talking	Yes	No	No	No
chatter	Yes	No	Yes	No

As nouns, chatter is a hyponym of talking; that is, chatter is a word with a more specific, narrower meaning than talking:

talking (noun)	chatter (noun)
an exchange of ideas via conversation	noisy talk
	the high-pitched continuing noise made by animals (birds or monkeys)
	the rapid series of noises made by the parts of a machine

talking (verb)	chatter (verb)
	speak (about unimportant matters) rapidly and incessantly
	talk socially without exchanging too much information
	make noise as if chattering away
	cut unevenly with a chattering tool
	click repeatedly or uncontrollably