Symphytum officinale vs cumfrey

Symphytum officinale and cumfrey both are nouns.

Word	Noun	Adjective	Verb	Adverb
Symphytum officinale	Yes	No	No	No
cumfrey	Yes	No	No	No

As nouns, cumfrey is a hypernym of Symphytum officinale; that is, cumfrey is a word with a broader meaning than Symphytum officinale:

Symphytum officinale: European herb having small white, pink or purple flowers; naturalized as a weed in North America
cumfrey: perennial herbs of Europe and Iran; make rapidly growing groundcover for shaded areas

Other hypernyms of Symphytum officinale include comfrey.

Symphytum officinale (noun)	cumfrey (noun)
European herb having small white, pink or purple flowers; naturalized as a weed in North America	perennial herbs of Europe and Iran; make rapidly growing groundcover for shaded areas