chew the fat vs chit-chat

chew the fat is not a noun while chit-chat is a noun.

Word	Noun	Adjective	Verb	Adverb
chew the fat	No	No	Yes	No
chit-chat	Yes	No	Yes	No

As verbs, chew the fat and chit-chat are synonyms defined as:

chew the fat and chit-chat: talk socially without exchanging too much information

Other synonyms of chew the fat include chaffer, chat, chatter, chitchat, claver, confab, confabulate, gossip, jaw, natter, shoot the breeze, visit.

chew the fat (noun)	chit-chat (noun)
	light informal conversation for social occasions

chew the fat (verb)	chit-chat (verb)
talk socially without exchanging too much information	talk socially without exchanging too much information