bird's foot trefoil vs subshrub

bird's foot trefoil and subshrub both are nouns.

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

As nouns, subshrub is a hypernym of bird's foot trefoil; that is, subshrub is a word with a broader meaning than bird's foot trefoil:

bird's foot trefoil: European forage plant having claw-shaped pods introduced in America
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of bird's foot trefoil include suffrutex.

bird's foot trefoil (noun)	subshrub (noun)
European forage plant having claw-shaped pods introduced in America	low-growing woody shrub or perennial with woody base
Old World herb related to fenugreek