load has 21 distinct synonyms spread across 9 of its 14 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a quantity that can be processed or transported at one time
“the system broke down under excessive loads”
goods carried by a large vehicle
an amount of alcohol sufficient to intoxicate
“he got a load on and started a brawl”
the power output of a generator or power plant
an onerous or difficult concern
“the burden of responsibility”
a deposit of valuable ore occurring within definite boundaries separating it from surrounding rocks
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents
electrical device to which electrical power is delivered
Synonyms, antonyms and the broader and narrower relations for load come from Princeton University’s WordNet. Full sources and licences.
transfer from a storage device to a computer's memory
put (something) on a structure or conveyance
“load the bags onto the trucks”
corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
“adulterate liquor”