bumper vs bump

bumper and bump both are nouns.

Word	Noun	Adjective	Verb	Adverb
bumper	Yes	No	No	No
bump	Yes	No	Yes	No

bumper (noun)	bump (noun)
a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage	an impact (as from a collision)
a glass filled to the brim (especially as a toast)	something that bulges out or is protuberant or projects from its surroundings
	a lump on the body caused by a blow

bumper (verb)	bump (verb)
	knock against with force or violence
	remove or force from a position of dwelling previously occupied
	to play music at loud volume
	to enjoy some music greatly
	dance erotically or dance with the pelvis thrust forward
	come upon, as if by accident; meet with
	assign to a lower position; reduce in rank