car vs air bag

car and air bag both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
air bag	Yes	No	No	No

car (noun)	air bag (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a safety restraint in an automobile; the bag inflates on collision and prevents the driver or passenger from being thrown forward
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