'payload' definitions:

Definition of 'payload'

noun

The front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents [syn: warhead, payload, load]

noun

Goods carried by a large vehicle [syn: cargo, lading, freight, load, loading, payload, shipment, consignment]

Definition of 'payload'

From: GCIDE

payload \pay"load`\ (p[=a]"l[=o]d`) n. The part of a missile or torpedo that carries the explosive charge.
Syn: warhead, load. [WordNet 1.5]
2. The goods carried by a large vehicle.
Syn: cargo, lading, freight, load, loading, shipment, consignment. [WordNet 1.5]

Synonyms of 'payload'

From: Moby Thesaurus

atomic warhead,
baggage,
bird,
blast,
burden,
cargo,
carload,
cartload,
charge,
consignment,
freight,
freightage,
full load,
goods,
guided missile,
haul,
impedimenta,
lading,
load,
luggage,
missile,
nuclear warhead,
pack,
rocket,
shipload,
shipment,
thermonuclear warhead,
torpedo,
trailerload,
trainload,
truckload,
vanload,
war rocket,
warhead