brake pad vs restraint

brake pad and restraint both are nouns.

Word	Noun	Adjective	Verb	Adverb
brake pad	Yes	No	No	No
restraint	Yes	No	No	No

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

brake pad: one of the pads that apply friction to both sides of the brake disk
restraint: a device that retards something's motion

Other hypernyms of brake pad include constraint.

brake pad (noun)	restraint (noun)
one of the pads that apply friction to both sides of the brake disk	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