This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A part of the armament system in the forward part of a projectile, such as a guided missile, rocket, torpedo, bomb, or other munition, that contains either a nuclear or thermonuclear system, a high explosive system, chemical or biological agents, or inert materials intended to inflict damage on a target.

n. The part of a missile, projectile, torpedo, rocket, or other munition which contains either the nuclear or thermonuclear system, high explosive system, chemical or biological agents, or inert materials intended to inflict damage.

n. the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents

"In this cold! what they call a warhead, urea nitrate fuse fashioned from a NAIL, striking a BULLET casing,"

explosive   

nuclear warhead    thermonuclear warhead    nuke    atomic warhead   

launchers    grenade    missile    torpedo    reactor    bomb    projectile    nuke    munitions    propulsion