avocado tree vs fruit tree

avocado tree and fruit tree both are nouns.

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

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

avocado tree (noun)	fruit tree (noun)
tropical American tree bearing large pulpy green fruits	tree bearing edible fruit