car vs side curtain airbag

car and side curtain airbag both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
side curtain airbag	Yes	No	No	No

car (noun)	side curtain airbag (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a safety device installed in cars that deploys by rapidly inflating to protect the head and provide rollover protection.
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