sour cherry vs fruit tree

sour cherry and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour cherry	Yes	No	No	No
fruit tree	Yes	No	No	No

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

sour cherry (noun)	fruit tree (noun)
acid cherries used for pies and preserves	tree bearing edible fruit
rather small Eurasian tree producing red to black acid edible fruit
Australian tree with sour red fruit