cost increase vs increase

cost increase and increase both are nouns.

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

As nouns, increase is a hypernym of cost increase; that is, increase is a word with a broader meaning than cost increase:

Other hypernyms of cost increase include increment.

cost increase (noun)	increase (noun)
an increase in cost	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

cost increase (verb)	increase (verb)
	become bigger or greater in amount
	make bigger or more