holdfast vs restraint

holdfast and restraint both are nouns.

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

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

Other hypernyms of holdfast include constraint.

holdfast (noun)	restraint (noun)
restraint that attaches to something or holds something in place	the act of controlling by restraining someone or something
	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