litchi tree vs Nephelium litchi

litchi tree and Nephelium litchi both are nouns.

Word	Noun	Adjective	Verb	Adverb
litchi tree	Yes	No	No	No
Nephelium litchi	Yes	No	No	No

As nouns, litchi tree and Nephelium litchi are synonyms defined as:

litchi tree and Nephelium litchi: Chinese tree cultivated especially in Philippines and India for its edible fruit; sometimes placed in genus Nephelium

Other synonyms of litchi tree include lichee, litchi, Litchi chinensis.

litchi tree (noun)	Nephelium litchi (noun)
Chinese tree cultivated especially in Philippines and India for its edible fruit; sometimes placed in genus Nephelium	Chinese tree cultivated especially in Philippines and India for its edible fruit; sometimes placed in genus Nephelium