sluicegate vs head gate

sluicegate and head gate both are nouns.

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

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

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

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

sluicegate (noun)	head gate (noun)
regulator consisting of a valve or gate that controls the rate of water flow through a sluice	a gate upstream from a lock or canal that is used to control the flow of water at the upper end
	regulator consisting of a valve or gate that controls the rate of water flow through a sluice