burden vs dead load

burden and dead load both are nouns.

Word	Noun	Adjective	Verb	Adverb
burden	Yes	No	Yes	No
dead load	Yes	No	No	No

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

burden: weight to be borne or conveyed
dead load: a constant load on a structure (e.g. a bridge) due to the weight of the supported structure itself

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

burden (noun)	dead load (noun)
weight to be borne or conveyed	a constant load on a structure (e.g. a bridge) due to the weight of the supported structure itself
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)	dead load (verb)
impose a task upon, assign a responsibility to
weight down with a load