modification vs modify

modification is a noun but modify is not a noun.

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

modification (noun)	modify (noun)
the act of making something different (as e.g. the size of a garment)
slightly modified copy; not an exact copy
an event that occurs when something passes from one state or phase to another
the grammatical relation that exists when a word qualifies the meaning of the phrase

modification (verb)	modify (verb)
	make less severe or harsh or extreme
	add a modifier to a constituent
	cause to change; make different; cause a transformation