payload vs shipment

payload and shipment both are nouns.

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

As nouns, payload and shipment are synonyms defined as:

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

payload (noun)	shipment (noun)
goods carried by a large vehicle	the act of sending off something
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents	goods carried by a large vehicle