confab vs causerie

confab and causerie both are nouns.

Word	Noun	Adjective	Verb	Adverb
confab	Yes	No	Yes	No
causerie	Yes	No	No	No

As nouns, causerie is a hyponym of confab; that is, causerie is a word with a more specific, narrower meaning than confab:

confab (noun)	causerie (noun)
an informal conversation	light informal conversation for social occasions

confab (verb)	causerie (verb)
talk socially without exchanging too much information
have a conference in order to talk something over