caboose vs cabin car

caboose and cabin car both are nouns.

Word	Noun	Adjective	Verb	Adverb
caboose	Yes	No	No	No
cabin car	Yes	No	No	No

As nouns, caboose and cabin car are synonyms defined as:

caboose and cabin car: a car on a freight train for use of the train crew; usually the last car on the train

caboose (noun)	cabin car (noun)
a car on a freight train for use of the train crew; usually the last car on the train	a car on a freight train for use of the train crew; usually the last car on the train
the area for food preparation on a ship