guava vs guava bush

guava and guava bush both are nouns.

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

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

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

Other synonyms of guava include Psidium guajava, true guava.

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