Medicago sativa vs medick

Medicago sativa and medick both are nouns.

Word	Noun	Adjective	Verb	Adverb
Medicago sativa	Yes	No	No	No
medick	Yes	No	No	No

As nouns, medick is a hypernym of Medicago sativa; that is, medick is a word with a broader meaning than Medicago sativa:

Medicago sativa: important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop
medick: any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves

Other hypernyms of Medicago sativa include medic, trefoil.

Medicago sativa (noun)	medick (noun)
important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop	any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves