increase vs modify

increase is a noun but modify is not a noun.

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

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

Other hypernyms of increase include alter, change.

increase (noun)	modify (noun)
the act of increasing something
the amount by which something increases
a change resulting in an increase
a process of becoming larger or longer or more numerous or more important
a quantity that is added

increase (verb)	modify (verb)
become bigger or greater in amount	make less severe or harsh or extreme
make bigger or more	add a modifier to a constituent
	cause to change; make different; cause a transformation