chatter vs idle talk

chatter and idle talk both are nouns.

Word	Noun	Adjective	Verb	Adverb
chatter	Yes	No	Yes	No
idle talk	Yes	No	No	No

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

Other hyponyms of chatter include blether, chin music, prate, prattle.

chatter (noun)	idle talk (noun)
noisy talk	idle or foolish and irrelevant talk
the high-pitched continuing noise made by animals (birds or monkeys)
the rapid series of noises made by the parts of a machine

chatter (verb)	idle talk (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