car vs running board

car and running board both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
running board	Yes	No	No	No

car (noun)	running board (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a narrow footboard serving as a step beneath the doors of some old cars
a wheeled vehicle adapted to the rails of railroad
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