freight vs air-freight

freight is a noun but air-freight is not a noun.

Word	Noun	Adjective	Verb	Adverb
freight	Yes	No	Yes	No
air-freight	No	No	Yes	No

As verbs, air-freight is a hyponym of freight; that is, air-freight is a word with a more specific, narrower meaning than freight:

Other hyponyms of freight include air-ship, airfreight.

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

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