litchi tree vs litchi

litchi tree and litchi both are nouns.

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

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

litchi tree and 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 chinensis, Nephelium litchi.

litchi tree (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