gondola vs freight car

gondola and freight car both are nouns.

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

As nouns, freight car is a hypernym of gondola; that is, freight car is a word with a broader meaning than gondola:

gondola (noun)	freight car (noun)
long narrow flat-bottomed boat propelled by sculling; traditionally used on canals of Venice	a railway car that carries freight
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