parlor car vs palace car

parlor car and palace car both are nouns.

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

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

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

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

parlor car (noun)	palace 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