astringent vs medicinal drug

astringent and medicinal drug both are nouns.

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

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

astringent: a drug that causes contraction of body tissues and canals
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of astringent include medicament, medication, medicine.

astringent (noun)	medicinal drug (noun)
a drug that causes contraction of body tissues and canals	(medicine) something that treats or prevents or alleviates the symptoms of disease

astringent (adjective)	medicinal drug (adjective)
tending to draw together or constrict soft organic tissue
sour or bitter in taste