loading vs payload

loading and payload both are nouns.

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

As nouns, loading and payload are synonyms defined as:

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

loading (noun)	payload (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	the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents
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