The best replacement for atomic bomb is nuclear bomb.

The best alternatives to atomic bomb are rated as following:
★★★★★  nuclear bomb
★★★★  hydrogen bomb
★★  hydrogen
★★  nuclear missile
★★  h bomb
★  nuclear missile civ 5
★  nuke
★  firebombing
★  tsar bomba
★  nuclear
★  invasion of japan
★  volcano
★  thermonuclear
★  conventional bomb
★  nuclear warhead
★  nuclear reactor
  h-bomb
  regular bomb
  pearl harbor
  thermonuclear bomb
  neutron bomb
  normal bomb
  invasion

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Speaking about atomic bomb, one probably shouldn't forget about albert einstein.

Other search terms related to atomic bomb and their ratings are:
★★★★★ albert einstein
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atomic bomb
nuclear bomb
hydrogen bomb