car vs bumper

car and bumper both are nouns.

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

car (noun)	bumper (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a mechanical device consisting of bars at either end of a vehicle to absorb shock and prevent serious damage
a wheeled vehicle adapted to the rails of railroad	a glass filled to the brim (especially as a toast)
where passengers ride up and down
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant
a conveyance for passengers or freight on a cable railway