debase vs poison

debase is not a noun while poison is a noun.

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

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

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

debase (verb)	poison (verb)
lower in value by increasing the base-metal content	administer poison to
corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones	add poison to
corrupt morally or by intemperance or sensuality	kill with poison
	kill by its poison
	spoil as if by poison