WordNet sense 1 (a quantity that can be processed or transported at one time):

loading

WordNet sense 2 (a deposit of valuable ore occurring within definite boundaries separating it from surrounding rocks):

lode

WordNet sense 3 (an onerous or difficult concern):

burden, encumbrance, onus, incumbrance

WordNet sense 4 (the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents):

payload, warhead

WordNet sense 5 (goods carried by a large vehicle):

cargo, consignment, freight, lading, shipment

WordNet sense 6 (provide with munition):

charge

WordNet sense 7 (fill or place a load on):

lade, laden, load up