extort vs surcharge

extort is not a noun while surcharge is a noun.

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

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

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

extort (noun)	surcharge (noun)
	an additional charge (as for items previously omitted or as a penalty for failure to exercise common caution or common skill)

extort (verb)	surcharge (verb)
get or cause to become in a difficult or laborious manner	show an omission in (an account) for which credit ought to have been given
obtain by coercion or intimidation	fill to an excessive degree
obtain through intimidation	place too much a load on
	print a new denomination on a stamp or a banknote
	fill to capacity with people
	rip off; ask an unreasonable price
	charge an extra fee, as for a special service