melon vine vs gourd

melon vine and gourd both are nouns.

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

As nouns, gourd is a hypernym of melon vine; that is, gourd is a word with a broader meaning than melon vine:

melon vine: any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers
gourd: any vine of the family Cucurbitaceae that bears fruits with hard rinds

Other hypernyms of melon vine include gourd vine.

melon vine (noun)	gourd (noun)
any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers	bottle made from the dried shell of a bottle gourd
	any vine of the family Cucurbitaceae that bears fruits with hard rinds
	any of numerous inedible fruits with hard rinds