car vs railroad train

car and railroad train both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
railroad train	Yes	No	No	No

car (noun)	railroad train (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	public transport provided by a line of railway cars coupled together and drawn by a locomotive
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