floodgate vs restraint

floodgate and restraint both are nouns.

Word	Noun	Adjective	Verb	Adverb
floodgate	Yes	No	No	No
restraint	Yes	No	No	No

As nouns, restraint is a hypernym of floodgate; that is, restraint is a word with a broader meaning than floodgate:

floodgate (noun)	restraint (noun)
regulator consisting of a valve or gate that controls the rate of water flow through a sluice	the act of controlling by restraining someone or something
something that restrains a flood or outpouring	a device that retards something's motion
	discipline in personal and social activities
	lack of ornamentation
	a rule or condition that limits freedom
	the state of being physically constrained