Aaron's rod vs common mullein

Aaron's rod and common mullein both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aaron's rod	Yes	No	No	No
common mullein	Yes	No	No	No

As nouns, Aaron's rod and common mullein are synonyms defined as:

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

Aaron's rod (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