sharpen vs heighten

sharpen and heighten both are verbs.

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

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

Other hypernyms of sharpen include compound, deepen, intensify.

As verbs, sharpen and heighten are synonyms defined as:

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

Other hypernyms of sharpen include compound, deepen, intensify.

sharpen (verb)	heighten (verb)
become sharp or sharper	increase the level of
make crisp or more crisp and precise	become more extreme
raise the pitch of (musical notes)	make more extreme; raise in quantity, degree, or intensity
put (an image) into focus	make more intense, stronger, or more marked
make (one's senses) more acute	make (one's senses) more acute
give a point to	increase the height of
make sharp or sharper
make (images or sounds) sharp or sharper