Morus alba vs mulberry tree

Morus alba and mulberry tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Morus alba	Yes	No	No	No
mulberry tree	Yes	No	No	No

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

Morus alba: Asiatic mulberry with white to pale red fruit; leaves used to feed silkworms
mulberry tree: any of several trees of the genus Morus having edible fruit that resembles the blackberry

Other hypernyms of Morus alba include mulberry.

Morus alba (noun)	mulberry tree (noun)
Asiatic mulberry with white to pale red fruit; leaves used to feed silkworms	any of several trees of the genus Morus having edible fruit that resembles the blackberry