Neurontin vs antiepileptic

Neurontin and antiepileptic both are nouns.

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

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

Neurontin: 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 Neurontin include anticonvulsant, anticonvulsant drug, antiepileptic drug.

Neurontin (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)