overcharge vs extort

overcharge is a noun but extort is not a noun.

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

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

Other hyponyms of overcharge include gouge, rack, squeeze, wring.

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

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