overcharge vs overload

overcharge and overload both are nouns.

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

As verbs, overcharge and overload are synonyms defined as:

Other synonyms of overcharge include surcharge.

overcharge (noun)	overload (noun)
a price that is too high	an excessive burden
	an electrical load that exceeds the available electrical power

overcharge (verb)	overload (verb)
place too much a load on	fill to excess so that function is impaired
rip off; ask an unreasonable price	place too much a load on
	become overloaded