botulin vs botulismotoxin

botulin and botulismotoxin both are nouns.

Word	Noun	Adjective	Verb	Adverb
botulin	Yes	No	No	No
botulismotoxin	Yes	No	No	No

As nouns, botulin and botulismotoxin are synonyms defined as:

botulin and botulismotoxin: potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon

Other synonyms of botulin include botulinus toxin.

botulin (noun)	botulismotoxin (noun)
potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon	potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon