affairs vs dealings

affairs and dealings both are nouns.

Word	Noun	Adjective	Verb	Adverb
affairs	Yes	No	No	No
dealings	Yes	No	No	No

As nouns, dealings is a hypernym of affairs; that is, dealings is a word with a broader meaning than affairs:

affairs: transactions of professional or public interest
dealings: the act of transacting within or between groups (as carrying on commercial activities)

Other hypernyms of affairs include dealing, transaction.

affairs (noun)	dealings (noun)
transactions of professional or public interest	the act of transacting within or between groups (as carrying on commercial activities)
matters of personal concern	social or verbal interchange (usually followed by `with')
	mutual dealings or connections or communications among persons or groups