pomegranate tree vs fruit tree

pomegranate tree and fruit tree both are nouns.

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

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

pomegranate tree: shrub or small tree native to southwestern Asia having large red many-seeded fruit
fruit tree: tree bearing edible fruit

pomegranate tree (noun)	fruit tree (noun)
shrub or small tree native to southwestern Asia having large red many-seeded fruit	tree bearing edible fruit