confab vs conversation

confab and conversation both are nouns.

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

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

confab: an informal conversation
conversation: the use of speech for informal exchange of views or ideas or information etc.

confab (noun)	conversation (noun)
an informal conversation	the use of speech for informal exchange of views or ideas or information etc.

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