passageway vs duct

passageway and duct both are nouns.

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

As nouns, duct is a hyponym of passageway; that is, duct is a word with a more specific, narrower meaning than passageway:

passageway: a path or channel or duct through or along which something may pass
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

passageway (noun)	duct (noun)
a passage between rooms or between buildings	an enclosed conduit for a fluid
a path or channel or duct through or along which something may pass	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
	a continuous tube formed by a row of elongated cells lacking intervening end walls