1.  payload(n = noun.artifact) load, warhead - the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents; Array
is a kind of explosive
is a part of guided missile
has particulars: atomic warhead, nuclear warhead, nuke, thermonuclear warhead

2.  payload(n = noun.artifact) cargo, consignment, freight, lading, load, loading, shipment - goods carried by a large vehicle; Array
is a kind of merchandise, product, ware

1.  The part of a missile or torpedo that carries the explosive charge. [WordNet 1.5]

2.  The goods carried by a large vehicle. [WordNet 1.5]

payload, n.
1 the part of an aircraft's load from which revenue is derived.
2 a the explosive warhead carried by an aircraft or rocket. b the instruments etc. carried by a spaceship.