airfare vs transportation

airfare and transportation both are nouns.

Word	Noun	Adjective	Verb	Adverb
airfare	Yes	No	No	No
transportation	Yes	No	No	No

As nouns, transportation is a hypernym of airfare; that is, transportation is a word with a broader meaning than airfare:

Other hypernyms of airfare include fare.

airfare (noun)	transportation (noun)
the fare charged for traveling by airplane	the act of moving something from one location to another
	the commercial enterprise of moving goods and materials
	the act of expelling a person from their native land
	a facility consisting of the means and equipment necessary for the movement of passengers or goods
	the sum charged for riding in a public conveyance