palace car vs parlour car

palace car and parlour car both are nouns.

Word	Noun	Adjective	Verb	Adverb
palace car	Yes	No	No	No
parlour car	Yes	No	No	No

As nouns, palace car and parlour car are synonyms defined as:

palace car and parlour car: a passenger car for day travel; you pay extra fare for individual chairs

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

palace car (noun)	parlour 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