mad-dog weed vs mad-dog skullcap

mad-dog weed and mad-dog skullcap both are nouns.

Word	Noun	Adjective	Verb	Adverb
mad-dog weed	Yes	No	No	No
mad-dog skullcap	Yes	No	No	No

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

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

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

mad-dog weed (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