rambutan vs rambutan tree

rambutan and rambutan tree both are nouns.

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

As nouns, rambutan and rambutan tree are synonyms defined as:

Other synonyms of rambutan include Nephelium lappaceum, rambotan.

rambutan (noun)	rambutan tree (noun)
pleasantly acid bright red oval Malayan fruit covered with soft spines	Malayan tree bearing spiny red fruit
Malayan tree bearing spiny red fruit