bird's foot trefoil vs bird's foot clover

bird's foot trefoil and bird's foot clover both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird's foot trefoil	Yes	No	No	No
bird's foot clover	Yes	No	No	No

As nouns, bird's foot trefoil and bird's foot clover are synonyms defined as:

bird's foot trefoil and bird's foot clover: European forage plant having claw-shaped pods introduced in America

Other synonyms of bird's foot trefoil include babies' slippers, bacon and eggs, Lotus corniculatus.

bird's foot trefoil (noun)	bird's foot clover (noun)
European forage plant having claw-shaped pods introduced in America	European forage plant having claw-shaped pods introduced in America
Old World herb related to fenugreek