true guava vs fruit tree

true guava and fruit tree both are nouns.

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

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

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

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