sickle alfalfa vs medick

sickle alfalfa and medick both are nouns.

Word	Noun	Adjective	Verb	Adverb
sickle alfalfa	Yes	No	No	No
medick	Yes	No	No	No

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

sickle alfalfa: European medic naturalized in North America having yellow flowers and sickle-shaped pods
medick: any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves

Other hypernyms of sickle alfalfa include medic, trefoil.

sickle alfalfa (noun)	medick (noun)
European medic naturalized in North America having yellow flowers and sickle-shaped pods	any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves