restraint vs brake pad

restraint and brake pad both are nouns.

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

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

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

restraint (noun)	brake pad (noun)
the act of controlling by restraining someone or something	one of the pads that apply friction to both sides of the brake disk
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