The Collaborative International Dictionary of English v.0.48:

nuclear warhead \nuclear warhead\ n.
   The warhead of a missile containing an atom bomb or hydrogen
   bomb.

   Syn: atomic warhead, thermonuclear warhead, nuke.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

nuclear warhead
    n 1: the warhead of a missile designed to deliver an atom bomb
         [syn: atomic warhead, nuclear warhead, thermonuclear
         warhead, nuke]