carambola tree vs star fruit

carambola tree and star fruit both are nouns.

Word	Noun	Adjective	Verb	Adverb
carambola tree	Yes	No	No	No
star fruit	Yes	No	No	No

carambola tree (noun)	star fruit (noun)
East Indian tree bearing deeply ridged yellow-brown fruit	deeply ridged yellow-brown tropical fruit; used raw as a vegetable or in salad or when fully ripe as a dessert