wagon-lit vs sleeping car

wagon-lit and sleeping car both are nouns.

Word	Noun	Adjective	Verb	Adverb
wagon-lit	Yes	No	No	No
sleeping car	Yes	No	No	No

As nouns, wagon-lit and sleeping car are synonyms defined as:

wagon-lit and sleeping car: a passenger car that has berths for sleeping

Other synonyms of wagon-lit include sleeper.

wagon-lit (noun)	sleeping car (noun)
a passenger car that has berths for sleeping	a passenger car that has berths for sleeping