papaya tree vs papaia

papaya tree and papaia both are nouns.

Word	Noun	Adjective	Verb	Adverb
papaya tree	Yes	No	No	No
papaia	Yes	No	No	No

As nouns, papaya tree and papaia are synonyms defined as:

papaya tree and papaia: tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit

Other synonyms of papaya tree include Carica papaya, melon tree, papaya, pawpaw.

papaya tree (noun)	papaia (noun)
tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit	tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit