Onomatopoeia refers to the formation of words, which (when spoken aloud) imitate the sounds related with the things/actions they refer to.
Chatter: Click together repeatedly, babble, rant, etc.
Buzz: Low murmuring sound, hum, drone, etc.
My teeth were chattering in the cold.
We woke up to the chattering of monkeys.
The Chairman’s arrival ended the buzz in the conference room.
The buzzing of the doorbell was maddening.