great mullein vs common mullein

great mullein and common mullein both are nouns.

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

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

great mullein and common 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 great mullein include Aaron's rod, flannel mullein, torch, Verbascum thapsus, woolly mullein.

great mullein (noun)	common 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