Cydonia oblonga vs fruit tree

Cydonia oblonga and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cydonia oblonga	Yes	No	No	No
fruit tree	Yes	No	No	No

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

Cydonia oblonga: small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated
fruit tree: tree bearing edible fruit

Cydonia oblonga (noun)	fruit tree (noun)
small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated	tree bearing edible fruit