great mullein vs Verbascum thapsus

great mullein and Verbascum thapsus both are nouns.

Word	Noun	Adjective	Verb	Adverb
great mullein	Yes	No	No	No
Verbascum thapsus	Yes	No	No	No

As nouns, great mullein and Verbascum thapsus are synonyms defined as:

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

great mullein (noun)	Verbascum thapsus (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