handling vs unloading

handling and unloading both are nouns.

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

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

handling: manual (or mechanical) carrying or moving or delivering or working with something
unloading: the labor of taking a load of something off of or out of a vehicle or ship or container etc.

Other hyponyms of handling include materials handling, loading.

handling (noun)	unloading (noun)
manual (or mechanical) carrying or moving or delivering or working with something	the labor of taking a load of something off of or out of a vehicle or ship or container etc.
the action of touching with the hands (or the skillful use of the hands) or by the use of mechanical means
the management of someone or something