pistachio tree vs Pistacia vera

pistachio tree and Pistacia vera both are nouns.

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

As nouns, pistachio tree and Pistacia vera are synonyms defined as:

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

Other synonyms of pistachio tree include pistachio.

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