melon tree vs papaya tree

melon tree and papaya tree both are nouns.

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

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

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

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

melon tree (noun)	papaya 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