lounge car vs railroad car

lounge car and railroad car both are nouns.

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

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

Other hypernyms of lounge car include car, railcar, railway car.

lounge car (noun)	railroad car (noun)
railroad car having a bar and tables and lounge chairs	a wheeled vehicle adapted to the rails of railroad