freight vs cargo

freight and cargo both are nouns.

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

As nouns, freight and cargo are synonyms defined as:

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

freight (noun)	cargo (noun)
transporting goods commercially at rates cheaper than express rates	goods carried by a large vehicle
goods carried by a large vehicle
the charge for transporting something by common carrier

freight (verb)	cargo (verb)
load with goods for transportation
transport commercially as cargo