botulinum toxin vs neurolysin

botulinum toxin and neurolysin both are nouns.

Word	Noun	Adjective	Verb	Adverb
botulinum toxin	Yes	No	No	No
neurolysin	Yes	No	No	No

As nouns, neurolysin is a hypernym of botulinum toxin; that is, neurolysin is a word with a broader meaning than botulinum toxin:

botulinum toxin: any of several neurotoxins that are produced by the anaerobic bacterium Clostridium botulinum; causes muscle paralysis
neurolysin: any toxin that affects neural tissues

Other hypernyms of botulinum toxin include neurotoxin.

botulinum toxin (noun)	neurolysin (noun)
any of several neurotoxins that are produced by the anaerobic bacterium Clostridium botulinum; causes muscle paralysis	any toxin that affects neural tissues