airway vs duct

airway and duct both are nouns.

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

As nouns, duct is a hypernym of airway; that is, duct is a word with a broader meaning than airway:

airway (noun)	duct (noun)
a commercial enterprise that provides scheduled flights for passengers	an enclosed conduit for a fluid
a duct that provides ventilation (as in mines)	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
the passages through which air enters and leaves the body	a continuous tube formed by a row of elongated cells lacking intervening end walls
a designated route followed by airplanes in flying from one airport to another