toxicant vs toxin

toxicant and toxin both are nouns.

Word	Noun	Adjective	Verb	Adverb
toxicant	Yes	Yes	No	No
toxin	Yes	No	No	No

As nouns, toxin is a hyponym of toxicant; that is, toxin is a word with a more specific, narrower meaning than toxicant:

toxicant: any substance that causes injury or illness or death of a living organism
toxin: a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species

Other hyponyms of toxicant include atropine, hyoscyamine, selenite.

toxicant (noun)	toxin (noun)
any substance that causes injury or illness or death of a living organism	a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species

toxicant (adjective)	toxin (adjective)
having the qualities or effects of a poison