refocus vs sharpen

refocus and sharpen both are verbs.

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

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

Other hypernyms of refocus include focalise, focalize, focus.

refocus (verb)	sharpen (verb)
put again into focus or focus more sharply	become sharp or sharper
focus anew	make crisp or more crisp and precise
focus once again	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