penstock vs conduit

penstock and conduit both are nouns.

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

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

penstock: conduit that carries a rapid flow of water controlled by a sluicegate
conduit: a passage (a pipe or tunnel) through which water or electric wires can pass

penstock (noun)	conduit (noun)
conduit that carries a rapid flow of water controlled by a sluicegate	a passage (a pipe or tunnel) through which water or electric wires can pass
regulator consisting of a valve or gate that controls the rate of water flow through a sluice