airway vs skyway

airway and skyway both are nouns.

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

As nouns, airway and skyway are synonyms defined as:

airway and skyway: a designated route followed by airplanes in flying from one airport to another

Other synonyms of airway include air lane, flight path.

airway (noun)	skyway (noun)
a commercial enterprise that provides scheduled flights for passengers	a designated route followed by airplanes in flying from one airport to another
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