chat vs chaffer

chat is a noun but chaffer is not a noun.

Word	Noun	Adjective	Verb	Adverb
chat	Yes	No	Yes	No
chaffer	No	No	Yes	No

As verbs, chat and chaffer are synonyms defined as:

chat (noun)	chaffer (noun)
songbirds having a chattering call
birds having a chattering call
an informal conversation

chat (verb)	chaffer (verb)
talk socially without exchanging too much information	talk socially without exchanging too much information
	wrangle (over a price, terms of an agreement, etc.)