Both words are technically interchangeable, so your question cannot be answered as written.
Perhaps you meant which is bigger fission or fusion bomb?
Define bigger: size or yield?
The biggest bombs ever built in both size and yield have been fusion. But many modern fission bombs are bigger physically than fusion bombs with bigger yield and some fission bombs have bigger yield than some fusion bombs. Confused?
It all depends on purpose.
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An atom bomb and a nuclear bomb are the same thing - both terms refer to a type of weapon that uses nuclear fission or fusion to release a large amount of destructive energy. So, they are of the same size and power.
Yes, atom bomb and nuke are commonly used terms to refer to nuclear weapons that release destructive energy by splitting atoms in a process called nuclear fission. In general, "nuke" is a more colloquial term while "atom bomb" is more formal.
An atom bomb is a type of nuclear weapon that releases immense amounts of energy by splitting atoms through a process called nuclear fission. This results in a powerful explosion that can cause widespread destruction.
A nuclear bomb and an atomic bomb are actually the same thing. Both terms refer to a type of explosive device that releases energy by nuclear reactions. The power of the explosion depends on the type of nuclear reactions involved and the amount of fissile material present in the bomb.
An atomic bomb is a nuclear weapon. A nuclear fusion bomb, (hydrogen, is usually much stronger than a nuclear fission bomb (uranium or plutonium). The weapons detonated in Japan during WWII measured about 15 kilotons equivalent of TNT. Today, most nuclear weapons are measured by megaton (1000X kiloton) equivalents up to a bomb built by the Russians with a possible yield of 100 megatons.
A hydrogen bomb is more destructive than an atom bomb. A hydrogen bomb releases much more explosive energy through nuclear fusion reactions, whereas an atom bomb relies on nuclear fission reactions. As a result, a hydrogen bomb can produce a significantly larger explosion and more widespread damage.