rambutan tree vs fruit tree

rambutan tree and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
rambutan tree	Yes	No	No	No
fruit tree	Yes	No	No	No

As nouns, fruit tree is a hypernym of rambutan tree; that is, fruit tree is a word with a broader meaning than rambutan tree:

rambutan tree (noun)	fruit tree (noun)
Malayan tree bearing spiny red fruit	tree bearing edible fruit