poison vs demoralise

poison is a noun but demoralise is not a noun.

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

As verbs, demoralise is a hypernym of poison; that is, demoralise is a word with a broader meaning than poison:

Other hypernyms of poison include corrupt, debase, debauch, demoralize, deprave, misdirect, pervert, profane, subvert, vitiate.

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

poison (verb)	demoralise (verb)
administer poison to	lower someone's spirits; make downhearted
add poison to	corrupt morally or by intemperance or sensuality
kill with poison
kill by its poison
spoil as if by poison