parlor car vs drawing-room car

parlor car and drawing-room car both are nouns.

Word	Noun	Adjective	Verb	Adverb
parlor car	Yes	No	No	No
drawing-room car	Yes	No	No	No

As nouns, parlor car and drawing-room car are synonyms defined as:

parlor car and drawing-room car: a passenger car for day travel; you pay extra fare for individual chairs

Other synonyms of parlor car include chair car, palace car, parlour car.

parlor car (noun)	drawing-room car (noun)
a passenger car for day travel; you pay extra fare for individual chairs	a passenger car for day travel; you pay extra fare for individual chairs