bulletproof vest vs vest

bulletproof vest and vest both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulletproof vest	Yes	No	No	No
vest	Yes	No	Yes	No

As nouns, vest is a hypernym of bulletproof vest; that is, vest is a word with a broader meaning than bulletproof vest:

Other hypernyms of bulletproof vest include body armor, body armour, cataphract, coat of mail, suit of armor, suit of armour, waistcoat.

bulletproof vest (noun)	vest (noun)
a vest capable of resisting the impact of a bullet	a collarless men's undergarment for the upper part of the body
	a man's sleeveless garment worn underneath a coat

bulletproof vest (verb)	vest (verb)
	clothe formally; especially in ecclesiastical robes
	clothe oneself in ecclesiastical garments
	place (authority, property, or rights) in the control of a person or group of persons
	become legally vested
	provide with power and authority