payload vs cargo

payload and cargo both are nouns.

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

As nouns, payload and cargo are synonyms defined as:

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

payload (noun)	cargo (noun)
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