tunnel vs car

tunnel and car both are nouns.

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

tunnel (noun)	car (noun)
a passageway through or under something, usually underground (especially one for trains or cars)	a motor vehicle with four wheels; usually propelled by an internal combustion engine
a hole made by an animal, usually for shelter	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

tunnel (verb)	car (verb)
force a way through
move through by or as by digging