Morus nigra vs mulberry

Morus nigra and mulberry both are nouns.

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

As nouns, mulberry is a hypernym of Morus nigra; that is, mulberry is a word with a broader meaning than Morus nigra:

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

Other hypernyms of Morus nigra include mulberry tree.

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