melon tree vs Carica papaya

melon tree and Carica papaya both are nouns.

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

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

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

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

melon tree (noun)	Carica papaya (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