duct vs conduit

duct and conduit both are nouns.

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

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

duct: an enclosed conduit for a fluid
conduit: a passage (a pipe or tunnel) through which water or electric wires can pass

duct (noun)	conduit (noun)
an enclosed conduit for a fluid	a passage (a pipe or tunnel) through which water or electric wires can 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