enhance vs heighten

enhance and heighten both are verbs.

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

As verbs, enhance and heighten are synonyms defined as:

Other synonyms of enhance include raise.

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

Other hypernyms of enhance include compound, deepen, intensify.

enhance (verb)	heighten (verb)
increase the level of	increase the level of
make better or more attractive	become more extreme
	make more extreme; raise in quantity, degree, or intensity
	make more intense, stronger, or more marked
	make (one's senses) more acute
	increase the height of