melon vine vs melon

melon vine and melon both are nouns.

Word	Noun	Adjective	Verb	Adverb
melon vine	Yes	No	No	No
melon	Yes	No	No	No

As nouns, melon vine and melon are synonyms defined as:

melon vine and melon: any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers

melon vine (noun)	melon (noun)
any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers	any of numerous fruits of the gourd family having a hard rind and sweet juicy flesh
	any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers