confab vs gabfest

confab and gabfest both are nouns.

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

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

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

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