Pistacia vera vs nut tree

Pistacia vera and nut tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pistacia vera	Yes	No	No	No
nut tree	Yes	No	No	No

As nouns, nut tree is a hypernym of Pistacia vera; that is, nut tree is a word with a broader meaning than Pistacia vera:

Pistacia vera: small tree of southern Europe and Asia Minor bearing small hard-shelled nuts
nut tree: tree bearing edible nuts

Pistacia vera (noun)	nut tree (noun)
small tree of southern Europe and Asia Minor bearing small hard-shelled nuts	tree bearing edible nuts