mulberry vs fruit tree

mulberry and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
mulberry	Yes	No	No	No
fruit tree	Yes	No	No	No

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

mulberry: any of several trees of the genus Morus having edible fruit that resembles the blackberry
fruit tree: tree bearing edible fruit

mulberry (noun)	fruit tree (noun)
sweet usually dark purple blackberry-like fruit of any of several mulberry trees of the genus Morus	tree bearing edible fruit
any of several trees of the genus Morus having edible fruit that resembles the blackberry