chatter vs natter

chatter is a noun but natter is not a noun.

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

As verbs, chatter and natter are synonyms defined as:

chatter and natter: talk socially without exchanging too much information

chatter (noun)	natter (noun)
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

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