Heuchera americana vs alumroot

Heuchera americana and alumroot both are nouns.

Word	Noun	Adjective	Verb	Adverb
Heuchera americana	Yes	No	No	No
alumroot	Yes	No	No	No

As nouns, alumroot is a hypernym of Heuchera americana; that is, alumroot is a word with a broader meaning than Heuchera americana:

Heuchera americana: plant with basal leaves mottled with white and flowers in lax panicles on erect stems
alumroot: any of several herbs of the genus Heuchera

Other hypernyms of Heuchera americana include alumbloom.

Heuchera americana (noun)	alumroot (noun)
plant with basal leaves mottled with white and flowers in lax panicles on erect stems	any of several herbs of the genus Heuchera