Japanese persimmon vs persimmon

Japanese persimmon and persimmon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese persimmon	Yes	No	No	No
persimmon	Yes	No	No	No

As nouns, persimmon is a hypernym of Japanese persimmon; that is, persimmon is a word with a broader meaning than Japanese persimmon:

Japanese persimmon: small deciduous Asiatic tree bearing large red or orange edible astringent fruit
persimmon: any of several tropical trees of the genus Diospyros

Other hypernyms of Japanese persimmon include persimmon tree.

Japanese persimmon (noun)	persimmon (noun)
small deciduous Asiatic tree bearing large red or orange edible astringent fruit	orange fruit resembling a plum; edible when fully ripe
	any of several tropical trees of the genus Diospyros