Cucumis sativus vs melon vine

Cucumis sativus and melon vine both are nouns.

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

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

Cucumis sativus: a melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit
melon vine: any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers

Other hypernyms of Cucumis sativus include melon.

Cucumis sativus (noun)	melon vine (noun)
a melon vine of the genus Cucumis; cultivated from earliest times for its cylindrical green fruit	any of various fruit of cucurbitaceous vines including: muskmelons, watermelons, cantaloupes, cucumbers