Synonyms for Encumbrance (same or very similar meaning)
WordNet sense 1 (a charge against property (as a lien or mortgage)):
incumbranceWordNet sense 2 (an onerous or difficult concern):
burden, load, onusWordNet sense 3 (any obstruction that impedes or is burdensome):
hindrance, hitch, interference, preventative, preventive, hinderanceFrom the ODE community, based on WordNetadd/edit