gazump vs overcharge

gazump is not a noun while overcharge is a noun.

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

As verbs, gazump and overcharge are synonyms defined as:

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

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

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