blocker vs medicinal drug

blocker and medicinal drug both are nouns.

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

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

blocker: a class of drugs that inhibit (block) some biological process
medicinal drug: (medicine) something that treats or prevents or alleviates the symptoms of disease

Other hypernyms of blocker include medicament, medication, medicine.

blocker (noun)	medicinal drug (noun)
a class of drugs that inhibit (block) some biological process	(medicine) something that treats or prevents or alleviates the symptoms of disease
a football player whose responsibility is to block players attempting to stop an offensive play