burden vs superload

burden and superload both are nouns.

Word	Noun	Adjective	Verb	Adverb
burden	Yes	No	Yes	No
superload	Yes	No	No	No

As nouns, superload is a hyponym of burden; that is, superload is a word with a more specific, narrower meaning than burden:

burden: weight to be borne or conveyed
superload: a variable load on a structure (e.g. a bridge) such as moving traffic

Other hyponyms of burden include burthen, dead load, live load, millstone, overburden, overload, overload.

burden (noun)	superload (noun)
weight to be borne or conveyed	a variable load on a structure (e.g. a bridge) such as moving traffic
the central idea that is expanded in a document or discourse
an onerous or difficult concern
the central meaning or theme of a speech or literary work

burden (verb)	superload (verb)
impose a task upon, assign a responsibility to
weight down with a load