passage vs conduit

passage and conduit both are nouns.

Word	Noun	Adjective	Verb	Adverb
passage	Yes	No	No	No
conduit	Yes	No	No	No

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

passage: a way through or along which someone or something may pass
conduit: a passage (a pipe or tunnel) through which water or electric wires can pass

Other hyponyms of passage include adit, aisle, channel, cul, cul de sac, dead end, fish ladder, passageway, right of way, shaft, throat.

passage (noun)	conduit (noun)
a journey usually by ship	a passage (a pipe or tunnel) through which water or electric wires can pass
the passing of a law by a legislative body
the act of passing something to another person
the act of passing from one state or place to the next
a bodily reaction of changing from one place or stage to another
a way through or along which someone or something may pass
a path or channel or duct through or along which something may pass
a section of text; particularly a section of medium length
a short section of a musical composition
the motion of one object relative to another