brake pad vs constraint

brake pad and constraint both are nouns.

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

As nouns, constraint is a hypernym of brake pad; that is, constraint 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
constraint: a device that retards something's motion

Other hypernyms of brake pad include restraint.

brake pad (noun)	constraint (noun)
one of the pads that apply friction to both sides of the brake disk	the act of constraining; the threat or use of force to control the thoughts or behavior of others
	a device that retards something's motion
	the state of being physically constrained