airway vs airline

airway and airline both are nouns.

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

As nouns, airway and airline are synonyms defined as:

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

Other synonyms of airway include airline business.

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