respiratory tract vs airway

respiratory tract and airway both are nouns.

Word	Noun	Adjective	Verb	Adverb
respiratory tract	Yes	No	No	No
airway	Yes	No	No	No

As nouns, respiratory tract and airway are synonyms defined as:

respiratory tract and airway: the passages through which air enters and leaves the body

respiratory tract (noun)	airway (noun)
the passages through which air enters and leaves the body	a commercial enterprise that provides scheduled flights for passengers
	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