yellow trefoil vs black medick

yellow trefoil and black medick both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow trefoil	Yes	No	No	No
black medick	Yes	No	No	No

As nouns, yellow trefoil and black medick are synonyms defined as:

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

Other synonyms of yellow trefoil include hop clover, Medicago lupulina, nonesuch clover.

yellow trefoil (noun)	black medick (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