avens vs subshrub

avens and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
avens	Yes	No	No	No
subshrub	Yes	No	No	No

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

avens: any of various perennials of the genus Geum having usually pinnate basal leaves and variously colored flowers
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of avens include suffrutex.

avens (noun)	subshrub (noun)
any of various perennials of the genus Geum having usually pinnate basal leaves and variously colored flowers	low-growing woody shrub or perennial with woody base