sharpen vs change

sharpen is not a noun while change is a noun.

Word	Noun	Adjective	Verb	Adverb
sharpen	No	No	Yes	No
change	Yes	No	Yes	No

As verbs, change is a hypernym of sharpen; that is, change is a word with a broader meaning than sharpen:

Other hypernyms of sharpen include alter, modify.

As verbs, change is a hypernym of sharpen; that is, change is a word with a broader meaning than sharpen:

Other hypernyms of sharpen include alter, modify.

sharpen (noun)	change (noun)
	the action of changing something
	a different or fresh set of clothes
	a thing that is different
	a difference that is usually pleasant
	an event that occurs when something passes from one state or phase to another
	the result of alteration or modification
	coins of small denomination regarded collectively
	the balance of money received when the amount you tender is greater than the amount due
	money received in return for its equivalent in a larger denomination or a different currency
	a relational difference between states; especially between states before and after some event

sharpen (verb)	change (verb)
become sharp or sharper	undergo a change; become different in essence; losing one's or its original nature
make crisp or more crisp and precise	cause to change; make different; cause a transformation
raise the pitch of (musical notes)	become different in some particular way, without permanently losing one's or its former characteristics or essence
put (an image) into focus	change clothes; put on different clothes
make (one's senses) more acute	exchange or replace with another, usually of the same kind or category
give a point to	lay aside, abandon, or leave for another
make sharp or sharper	remove or replace the coverings of
make (images or sounds) sharp or sharper	become deeper in tone
	change from one vehicle or transportation line to another
	give to, and receive from, one another