papaya tree vs papaya

papaya tree and papaya both are nouns.

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

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

papaya tree and papaya: 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, papaia, pawpaw.

papaya tree (noun)	papaya (noun)
tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit	large oval melon-like tropical fruit with yellowish flesh
	tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit