gouge vs overcharge

gouge and overcharge both are nouns.

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

As verbs, overcharge is a hypernym of gouge; that is, overcharge is a word with a broader meaning than gouge:

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

gouge (noun)	overcharge (noun)
the act of gouging	a price that is too high
and edge tool with a blade like a trough for cutting channels or grooves
an impression in a surface (as made by a blow)

gouge (verb)	overcharge (verb)
force with the thumb	place too much a load on
make a groove in	rip off; ask an unreasonable price
obtain by coercion or intimidation