mulberry vs Morus nigra

mulberry and Morus nigra both are nouns.

Word	Noun	Adjective	Verb	Adverb
mulberry	Yes	No	No	No
Morus nigra	Yes	No	No	No

As nouns, Morus nigra is a hyponym of mulberry; that is, Morus nigra is a word with a more specific, narrower meaning than mulberry:

mulberry: any of several trees of the genus Morus having edible fruit that resembles the blackberry
Morus nigra: European mulberry having dark foliage and fruit

Other hyponyms of mulberry include Morus alba, white mulberry, black mulberry, Morus rubra, red mulberry.

mulberry (noun)	Morus nigra (noun)
sweet usually dark purple blackberry-like fruit of any of several mulberry trees of the genus Morus	European mulberry having dark foliage and fruit
any of several trees of the genus Morus having edible fruit that resembles the blackberry