Ononis spinosa vs subshrub

Ononis spinosa and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ononis spinosa	Yes	No	No	No
subshrub	Yes	No	No	No

As nouns, subshrub is a hypernym of Ononis spinosa; that is, subshrub is a word with a broader meaning than Ononis spinosa:

Ononis spinosa: Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of Ononis spinosa include suffrutex.

Ononis spinosa (noun)	subshrub (noun)
Eurasian plant having loose racemes of pink or purple flowers and spiny stems and tough roots	low-growing woody shrub or perennial with woody base