airline vs airway

airline and airway both are nouns.

Word	Noun	Adjective	Verb	Adverb
airline	Yes	No	No	No
airway	Yes	No	No	No

As nouns, airline and airway are synonyms defined as:

airline and airway: a commercial enterprise that provides scheduled flights for passengers

Other synonyms of airline include airline business.

airline (noun)	airway (noun)
a commercial enterprise that provides scheduled flights for passengers	a commercial enterprise that provides scheduled flights for passengers
a hose that carries air under pressure	a duct that provides ventilation (as in mines)
	the passages through which air enters and leaves the body
	a designated route followed by airplanes in flying from one airport to another