restraint vs floodgate

restraint and floodgate both are nouns.

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

As nouns, floodgate is a hyponym of restraint; that is, floodgate is a word with a more specific, narrower meaning than restraint:

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