palace car vs parlor car

palace car and parlor car both are nouns.

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

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

palace car and parlor 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, parlour car.

palace car (noun)	parlor 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