deepen vs heighten

deepen and heighten both are verbs.

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

As verbs, deepen and heighten are synonyms defined as:

Other synonyms of deepen include compound, intensify.

As verbs, heighten is a hyponym of deepen; that is, heighten is a word with a more specific, narrower meaning than deepen:

Other hyponyms of deepen include heat up, hot up, screw up, fan, enhance, raise, amplify, sharpen, sharpen.

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