blue pimpernel vs mad-dog skullcap

blue pimpernel and mad-dog skullcap both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue pimpernel	Yes	No	No	No
mad-dog skullcap	Yes	No	No	No

As nouns, blue pimpernel and mad-dog skullcap are synonyms defined as:

blue pimpernel and mad-dog skullcap: an American mint that yields a resinous exudate used especially formerly as an antispasmodic

Other synonyms of blue pimpernel include blue skullcap, mad-dog weed, Scutellaria lateriflora.

blue pimpernel (noun)	mad-dog skullcap (noun)
an American mint that yields a resinous exudate used especially formerly as an antispasmodic	an American mint that yields a resinous exudate used especially formerly as an antispasmodic