strawberry guava vs fruit tree

strawberry guava and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
strawberry guava	Yes	No	No	No
fruit tree	Yes	No	No	No

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

strawberry guava (noun)	fruit tree (noun)
small tropical shrubby tree bearing small yellowish fruit	tree bearing edible fruit