litchi vs Nephelium litchi

litchi and Nephelium litchi both are nouns.

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

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

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

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

litchi (noun)	Nephelium litchi (noun)
Chinese fruit having a thin brittle shell enclosing a sweet jellylike pulp and a single seed; often dried	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