antispasmodic vs medicinal drug

antispasmodic and medicinal drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
antispasmodic	Yes	No	No	No
medicinal drug	Yes	No	No	No

As nouns, medicinal drug is a hypernym of antispasmodic; that is, medicinal drug is a word with a broader meaning than antispasmodic:

antispasmodic: a drug used to relieve or prevent spasms (especially of the smooth muscles)
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of antispasmodic include medicament, medication, medicine.

antispasmodic (noun)	medicinal drug (noun)
a drug used to relieve or prevent spasms (especially of the smooth muscles)	(medicine) something that treats or prevents or alleviates the symptoms of disease