overload vs overburden

overload and overburden both are nouns.

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

As nouns, overload and overburden are synonyms defined as:

overload (noun)	overburden (noun)
an excessive burden	an excessive burden
an electrical load that exceeds the available electrical power	the surface soil that must be moved away to get at coal seams and mineral deposits

overload (verb)	overburden (verb)
fill to excess so that function is impaired	burden with too much work or responsibility
place too much a load on	load with excessive weight
become overloaded