overcharge vs extortion

overcharge and extortion both are nouns.

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

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

overcharge (noun)	extortion (noun)
a price that is too high	the felonious act of extorting money (as by threats of violence)
	unjust exaction (as by the misuse of authority)
	an exorbitant charge

overcharge (verb)	extortion (verb)
place too much a load on
rip off; ask an unreasonable price