yellow trefoil vs Medicago lupulina

yellow trefoil and Medicago lupulina both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow trefoil	Yes	No	No	No
Medicago lupulina	Yes	No	No	No

As nouns, yellow trefoil and Medicago lupulina are synonyms defined as:

yellow trefoil and Medicago lupulina: prostrate European herb with small yellow flowers and curved black pods; naturalized in North America

Other synonyms of yellow trefoil include black medick, hop clover, nonesuch clover.

yellow trefoil (noun)	Medicago lupulina (noun)
prostrate European herb with small yellow flowers and curved black pods; naturalized in North America	prostrate European herb with small yellow flowers and curved black pods; naturalized in North America