meadow beauty vs subshrub

meadow beauty and subshrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
meadow beauty	Yes	No	No	No
subshrub	Yes	No	No	No

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

meadow beauty: any of several plants of the genus Rhexia usually having pink-purple to magenta flowers; eastern North America
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of meadow beauty include suffrutex.

meadow beauty (noun)	subshrub (noun)
any of several plants of the genus Rhexia usually having pink-purple to magenta flowers; eastern North America	low-growing woody shrub or perennial with woody base