incumbrance vs burden

incumbrance and burden both are nouns.

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

As nouns, incumbrance and burden are synonyms defined as:

Other synonyms of incumbrance include encumbrance, load, onus.

incumbrance (noun)	burden (noun)
any obstruction that impedes or is burdensome	weight to be borne or conveyed
an onerous or difficult concern	the central idea that is expanded in a document or discourse
a charge against property (as a lien or mortgage)	an onerous or difficult concern
	the central meaning or theme of a speech or literary work

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