duct vs passageway

duct and passageway both are nouns.

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

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

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

Other hypernyms of duct include passage.

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