gabapentin vs antiepileptic

gabapentin and antiepileptic both are nouns.

Word	Noun	Adjective	Verb	Adverb
gabapentin	Yes	No	No	No
antiepileptic	Yes	No	No	No

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

gabapentin: an anticonvulsant (trade name Neurontin) used to control some types of seizures in the treatment of epilepsy; also used to manage neuralgia caused by shingles
antiepileptic: a drug used to treat or prevent convulsions (as in epilepsy)

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

gabapentin (noun)	antiepileptic (noun)
an anticonvulsant (trade name Neurontin) used to control some types of seizures in the treatment of epilepsy; also used to manage neuralgia caused by shingles	a drug used to treat or prevent convulsions (as in epilepsy)