common mullein vs great mullein

common mullein and great mullein both are nouns.

Word	Noun	Adjective	Verb	Adverb
common mullein	Yes	No	No	No
great mullein	Yes	No	No	No

As nouns, common mullein and great mullein are synonyms defined as:

common mullein and great mullein: tall-stalked very woolly mullein with densely packed yellow flowers; ancient Greeks and Romans dipped the stalks in tallow for funeral torches

Other synonyms of common mullein include Aaron's rod, flannel mullein, torch, Verbascum thapsus, woolly mullein.

common mullein (noun)	great mullein (noun)
tall-stalked very woolly mullein with densely packed yellow flowers; ancient Greeks and Romans dipped the stalks in tallow for funeral torches	tall-stalked very woolly mullein with densely packed yellow flowers; ancient Greeks and Romans dipped the stalks in tallow for funeral torches