overcharge vs gazump

overcharge is a noun but gazump is not a noun.

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

As verbs, overcharge and gazump are synonyms defined as:

Other synonyms of overcharge include fleece, hook, pluck, plume, rob, soak, surcharge.

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

overcharge (verb)	gazump (verb)
place too much a load on	rip off; ask an unreasonable price
rip off; ask an unreasonable price	raise the price of something after agreeing on a lower price