Psidium guajava vs fruit tree

Psidium guajava and fruit tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Psidium guajava	Yes	No	No	No
fruit tree	Yes	No	No	No

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

Psidium guajava: small tropical American shrubby tree; widely cultivated in warm regions for its sweet globular yellow fruit
fruit tree: tree bearing edible fruit

Psidium guajava (noun)	fruit tree (noun)
small tropical American shrubby tree; widely cultivated in warm regions for its sweet globular yellow fruit	tree bearing edible fruit