Litchi chinensis vs litchi

Litchi chinensis and litchi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Litchi chinensis	Yes	No	No	No
litchi	Yes	No	No	No

As nouns, Litchi chinensis and litchi are synonyms defined as:

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

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

Litchi chinensis (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