extort vs overcharge

extort is not a noun while overcharge is a noun.

Word	Noun	Adjective	Verb	Adverb
extort	No	No	Yes	No
overcharge	Yes	No	Yes	No

As verbs, overcharge is a hypernym of extort; that is, overcharge is a word with a broader meaning than extort:

Other hypernyms of extort include fleece, gazump, hook, pluck, plume, rob, soak, surcharge.

extort (noun)	overcharge (noun)
	a price that is too high

extort (verb)	overcharge (verb)
get or cause to become in a difficult or laborious manner	place too much a load on
obtain by coercion or intimidation	rip off; ask an unreasonable price
obtain through intimidation