Nouns

(n)burden, load, encumbrance, incumbrance, onusan onerous or difficult concern“the burden of responsibility”, “that's a load off my mind”
(n)load, loading, burdenweight to be borne or conveyed
(n)effect, essence, burden, core, gistthe central meaning or theme of a speech or literary work
(n)burdenthe central idea that is expanded in a document or discourse

Verbs

(v)burden, burthen, weight, weight downweight down with a load
(v)charge, saddle, burdenimpose a task upon, assign a responsibility to“He charged her with cleaning up all the files over the weekend”