lucerne vs Medicago sativa

lucerne and Medicago sativa both are nouns.

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

As nouns, lucerne and Medicago sativa are synonyms defined as:

lucerne and Medicago sativa: important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop

Other synonyms of lucerne include alfalfa.

lucerne (noun)	Medicago sativa (noun)
important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop	important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop