buffalo gourd vs gourd vine

buffalo gourd and gourd vine both are nouns.

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

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

buffalo gourd: perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit
gourd vine: any vine of the family Cucurbitaceae that bears fruits with hard rinds

Other hypernyms of buffalo gourd include gourd.

buffalo gourd (noun)	gourd vine (noun)
perennial vine of dry parts of central and southwestern United States and Mexico having small hard mottled green inedible fruit	any vine of the family Cucurbitaceae that bears fruits with hard rinds