car vs rider

car and rider both are nouns.

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

car (noun)	rider (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a clause that is appended to a legislative bill
a wheeled vehicle adapted to the rails of railroad	a traveler who actively rides an animal (as a horse or camel)
where passengers ride up and down	a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant	a traveler who actively rides a vehicle (as a bicycle or motorcycle)
a conveyance for passengers or freight on a cable railway