Strategic bomber, submarine ICBM, ground ICBM
The question you are asking is equivalent in many ways to asking "Which number is bigger 27 or 27?" as an atomic explosive and a nuclear explosive are generally considered the same. The only difference is a bomb is typically an explosive delivered by a manned airplane whereas the explosive warhead on a missile is delivered by either a rocket or an unmanned airplane called a cruise missile. Either one could be a higher yield explosive, or as I stated in the example at the beginning of this answer both could be identical.
Without nuclear weapons, another nation with nuclear weapons could launch an attack without worry of a retaliation. There are not that many ways of diverting a long-range ballistic missile.
An atomic bomb is an explosive device that obtains its energy from the atomic nucleus. it is equally valid to call it a nuclear bomb, and it can obtain this energy through either of the processes of fission and/or fusion. There are many ways an atomic bomb can be delivered to its target: aircraft, unguided rocket, guided missile, cruise missile, torpedo, depth charge, hand carried, landmine (the target comes to it), artillery shell, jeep/tripod mounted bazooka, etc. Atomic bombs were also proposed and tested for several peaceful uses: blasting for construction (e.g. highways, railroads, canals), oil industry (e.g. natural gas extraction, oil extraction from tar sands), spacecraft propulsion (Project Orion 1958 to 1963), etc. A nuclear missile usually means a guided missile with an atomic bomb (aka warhead) as its payload, the guided missile is the means of delivering that atomic bomb to its target. However it is also possible in some circumstances to interpret nuclear missile as equivalent to nuclear rocket. A nuclear rocket uses a nuclear reactor to heat a gas (e.g. hydrogen) to propel the rocket, as usually visualized the payload of a nuclear rocket is a deep space probe of some kind (but it could just as easily be a manned spacecraft or an atomic bomb).
Sex
I don't see any reason to think nuclear energy could be used more efficiently there than elsewhere
there are many ways it might start. there could be so many different ways scenarios. the tension is grow thus making it more and more likely for it to happen.
Only in nuclear reactors and nuclear weapons.
There are many ways in which energy can be obtained, some of these sources could be: Solar Wind hydroelectric solar agricultural geothermal tidal nuclear :)
through CS
There are many ways. Nuclear Physics, Cosmology, Physicists, Biologist, Doctors, etc. Even Paleontology could be described as a form of science!
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by powering homes