vitiate vs poison

vitiate is not a noun while poison is a noun.

Word	Noun	Adjective	Verb	Adverb
vitiate	No	No	Yes	No
poison	Yes	No	Yes	No

As verbs, poison is a hyponym of vitiate; that is, poison is a word with a more specific, narrower meaning than vitiate:

vitiate (noun)	poison (noun)
	anything that harms or destroys
	any substance that causes injury or illness or death of a living organism

vitiate (verb)	poison (verb)
take away the legal force of or render ineffective	administer poison to
make imperfect	add poison to
corrupt morally or by intemperance or sensuality	kill with poison
	kill by its poison
	spoil as if by poison