burden vs require

burden is a noun but require is not a noun.

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

As verbs, require is a hypernym of burden; that is, require is a word with a broader meaning than burden:

Other hypernyms of burden include command.

burden (noun)	require (noun)
weight to be borne or conveyed
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)	require (verb)
impose a task upon, assign a responsibility to	make someone do something
weight down with a load	consider obligatory; request and expect
	have need of
	require as useful, just, or proper