poison vs modify

poison is a noun but modify is not a noun.

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

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

Other hypernyms of poison include alter, change.

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

poison (verb)	modify (verb)
administer poison to	make less severe or harsh or extreme
add poison to	add a modifier to a constituent
kill with poison	cause to change; make different; cause a transformation
kill by its poison
spoil as if by poison