heighten vs amplify

heighten and amplify both are verbs.

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

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

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

heighten (verb)	amplify (verb)
increase the level of	increase in size, volume or significance
become more extreme	increase the volume of
make more extreme; raise in quantity, degree, or intensity	exaggerate or make bigger
make more intense, stronger, or more marked	to enlarge beyond bounds or the truth
make (one's senses) more acute
increase the height of