chatter vs smatter

chatter is a noun but smatter is not a noun.

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

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

Other hyponyms of chatter include babble, blather, blether, blither.

chatter (noun)	smatter (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)	smatter (verb)
speak (about unimportant matters) rapidly and incessantly	speak with spotty or superficial knowledge
talk socially without exchanging too much information	to talk foolishly
make noise as if chattering away	work with in an amateurish manner
cut unevenly with a chattering tool
click repeatedly or uncontrollably