Nephelium litchi vs litchi

Nephelium litchi and litchi both are nouns.

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

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

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

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

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