flatten vs sharpen

flatten and sharpen both are verbs.

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

flatten (verb)	sharpen (verb)
become flat or flatter	become sharp or sharper
make flat or flatter	make crisp or more crisp and precise
lower the pitch of (musical notes)	raise the pitch of (musical notes)
	put (an image) into focus
	make (one's senses) more acute
	give a point to
	make sharp or sharper
	make (images or sounds) sharp or sharper