water gate vs sluicegate

water gate and sluicegate both are nouns.

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

As nouns, water gate and sluicegate are synonyms defined as:

water gate and sluicegate: regulator consisting of a valve or gate that controls the rate of water flow through a sluice

Other synonyms of water gate include floodgate, head gate, penstock, sluice valve.

water gate (noun)	sluicegate (noun)
regulator consisting of a valve or gate that controls the rate of water flow through a sluice	regulator consisting of a valve or gate that controls the rate of water flow through a sluice