handling vs dealing

handling and dealing both are nouns.

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

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

Other hyponyms of handling include bioremediation.

handling (noun)	dealing (noun)
manual (or mechanical) carrying or moving or delivering or working with something	method or manner of conduct in relation to others
the action of touching with the hands (or the skillful use of the hands) or by the use of mechanical means	the act of transacting within or between groups (as carrying on commercial activities)
the management of someone or something