parlor car vs chair car

parlor car and chair car both are nouns.

Word	Noun	Adjective	Verb	Adverb
parlor car	Yes	No	No	No
chair car	Yes	No	No	No

As nouns, parlor car and chair car are synonyms defined as:

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

Other synonyms of parlor car include drawing-room car, palace car, parlour car.

parlor car (noun)	chair 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