great mullein vs flannel mullein

great mullein and flannel mullein both are nouns.

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

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

great mullein and flannel 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, common mullein, torch, Verbascum thapsus, woolly mullein.

great mullein (noun)	flannel 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