guava bush vs guava

guava bush and guava both are nouns.

Word	Noun	Adjective	Verb	Adverb
guava bush	Yes	No	No	No
guava	Yes	No	No	No

As nouns, guava bush and guava are synonyms defined as:

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

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

guava bush (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