burden vs fardel

burden and fardel both are nouns.

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

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

Other hyponyms of burden include dead weight, imposition, pill.

burden (noun)	fardel (noun)
weight to be borne or conveyed	a burden (figuratively in the form of a bundle)
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)	fardel (verb)
impose a task upon, assign a responsibility to
weight down with a load