Psidium guajava vs guava

Psidium guajava and guava both are nouns.

Word	Noun	Adjective	Verb	Adverb
Psidium guajava	Yes	No	No	No
guava	Yes	No	No	No

As nouns, Psidium guajava and guava are synonyms defined as:

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

Other synonyms of Psidium guajava include guava bush, true guava.

Psidium guajava (noun)	guava (noun)
small tropical American shrubby tree; widely cultivated in warm regions for its sweet globular yellow fruit	tropical fruit having yellow skin and pink pulp; eaten fresh or used for e.g. jellies
	small tropical American shrubby tree; widely cultivated in warm regions for its sweet globular yellow fruit
	small tropical shrubby tree bearing small yellowish fruit