Senna obtusifolia vs subshrub

Senna obtusifolia and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Senna obtusifolia	Yes	No	No	No
subshrub	Yes	No	No	No

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

Senna obtusifolia: cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of Senna obtusifolia include suffrutex.

Senna obtusifolia (noun)	subshrub (noun)
cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia	low-growing woody shrub or perennial with woody base