burden vs incumbrance

burden and incumbrance both are nouns.

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

As nouns, burden and incumbrance are synonyms defined as:

Other synonyms of burden include encumbrance, load, onus.

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

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