papaya tree vs melon tree

papaya tree and melon tree both are nouns.

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

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

papaya tree and melon tree: 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, papaia, papaya, pawpaw.

papaya tree (noun)	melon tree (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