gab vs confab

gab and confab both are nouns.

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

As nouns, confab is a hypernym of gab; that is, confab is a word with a broader meaning than gab:

Other hypernyms of gab include chat, confabulation, schmoose, schmooze.

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

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