cabin car vs railway car

cabin car and railway car both are nouns.

Word	Noun	Adjective	Verb	Adverb
cabin car	Yes	No	No	No
railway car	Yes	No	No	No

As nouns, railway car is a hypernym of cabin car; that is, railway car is a word with a broader meaning than cabin car:

cabin car: a car on a freight train for use of the train crew; usually the last car on the train
railway car: a wheeled vehicle adapted to the rails of railroad

Other hypernyms of cabin car include car, railcar, railroad car.

cabin car (noun)	railway car (noun)
a car on a freight train for use of the train crew; usually the last car on the train	a wheeled vehicle adapted to the rails of railroad