domoic acid vs neurotoxin

domoic acid and neurotoxin both are nouns.

Word	Noun	Adjective	Verb	Adverb
domoic acid	Yes	No	No	No
neurotoxin	Yes	No	No	No

As nouns, neurotoxin is a hypernym of domoic acid; that is, neurotoxin is a word with a broader meaning than domoic acid:

domoic acid: a neurotoxin that is deadly for humans; found in various marine algae
neurotoxin: any toxin that affects neural tissues

Other hypernyms of domoic acid include neurolysin.

domoic acid (noun)	neurotoxin (noun)
a neurotoxin that is deadly for humans; found in various marine algae	any toxin that affects neural tissues