dealing vs dealings

dealing and dealings both are nouns.

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

As nouns, dealing and dealings are synonyms defined as:

dealing and dealings: the act of transacting within or between groups (as carrying on commercial activities)

Other synonyms of dealing include transaction.

dealing (noun)	dealings (noun)
method or manner of conduct in relation to others	the act of transacting within or between groups (as carrying on commercial activities)
the act of transacting within or between groups (as carrying on commercial activities)	social or verbal interchange (usually followed by `with')
	mutual dealings or connections or communications among persons or groups