Mesantoin vs antiepileptic drug

Mesantoin and antiepileptic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mesantoin	Yes	No	No	No
antiepileptic drug	Yes	No	No	No

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

Mesantoin: a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective
antiepileptic drug: a drug used to treat or prevent convulsions (as in epilepsy)

Other hypernyms of Mesantoin include anticonvulsant, anticonvulsant drug, antiepileptic.

Mesantoin (noun)	antiepileptic drug (noun)
a toxic anticonvulsant drug (trade name Mesantoin) used in the treatment of epilepsy when less toxic anticonvulsants have been ineffective	a drug used to treat or prevent convulsions (as in epilepsy)