loading vs cargo

loading and cargo both are nouns.

Word	Noun	Adjective	Verb	Adverb
loading	Yes	No	No	No
cargo	Yes	No	No	No

As nouns, loading and cargo are synonyms defined as:

Other synonyms of loading include consignment, freight, lading, load, payload, shipment.

loading (noun)	cargo (noun)
the labor of putting a load of something on or in a vehicle or ship or container etc.	goods carried by a large vehicle
goods carried by a large vehicle
weight to be borne or conveyed
a quantity that can be processed or transported at one time
the ratio of the gross weight of an airplane to some factor determining its lift