melon tree vs pawpaw

melon tree and pawpaw both are nouns.

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

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

melon tree and pawpaw: 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, papaya tree.

melon tree (noun)	pawpaw (noun)
tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit	fruit with yellow flesh; related to custard apples
	small tree native to the eastern United States having oblong leaves and fleshy fruit
	tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit