chair car vs palace car

chair car and palace car both are nouns.

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

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

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

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

chair 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