gondola vs gondola car

gondola and gondola car both are nouns.

Word	Noun	Adjective	Verb	Adverb
gondola	Yes	No	No	No
gondola car	Yes	No	No	No

As nouns, gondola and gondola car are synonyms defined as:

gondola and gondola car: a low flat-bottomed freight car with fixed sides but no roof

gondola (noun)	gondola car (noun)
long narrow flat-bottomed boat propelled by sculling; traditionally used on canals of Venice	a low flat-bottomed freight car with fixed sides but no roof
a low flat-bottomed freight car with fixed sides but no roof
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant