sluiceway vs penstock

sluiceway and penstock both are nouns.

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

As nouns, sluiceway and penstock are synonyms defined as:

sluiceway and penstock: conduit that carries a rapid flow of water controlled by a sluicegate

Other synonyms of sluiceway include sluice.

sluiceway (noun)	penstock (noun)
conduit that carries a rapid flow of water controlled by a sluicegate	conduit that carries a rapid flow of water controlled by a sluicegate
	regulator consisting of a valve or gate that controls the rate of water flow through a sluice