bottle gourd vs gourd vine

bottle gourd and gourd vine both are nouns.

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

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

bottle gourd: Old World climbing plant with hard-shelled bottle-shaped gourds as fruits
gourd vine: any vine of the family Cucurbitaceae that bears fruits with hard rinds

Other hypernyms of bottle gourd include gourd.

bottle gourd (noun)	gourd vine (noun)
Old World climbing plant with hard-shelled bottle-shaped gourds as fruits	any vine of the family Cucurbitaceae that bears fruits with hard rinds