sluice vs water gate

sluice and water gate both are nouns.

Word	Noun	Adjective	Verb	Adverb
sluice	Yes	No	Yes	No
water gate	Yes	No	No	No

sluice (noun)	water gate (noun)
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

sluice (verb)	water gate (verb)
irrigate with water from a sluice
draw through a sluice
transport in or send down a sluice
pour as if from a sluice