Megaton is a measurement of yield. Atomic bomb is a type of bomb and can have a wide range of yields.
Your question is equivalent to asking "Which is greater a tablespoon or a disposable plastic picnic spoon?" Tablespoon is a measurement of volume. Disposable plastic picnic spoon is a type of spoon.
You cannot compare incompatible things.
A megaton bomb is more damaging than an atomic bomb because it has a much higher explosive yield. A megaton bomb releases energy equivalent to the detonation of one million tons of TNT, while an atomic bomb typically releases energy equivalent to the detonation of thousands of tons of TNT.
A pure fission atomic bomb with a yield of a megaton or more is theoretically impossible. The problem is that the chain reaction would happen spontaneously before the device could even be completely built and the bomb parts would melt, resulting in a fizzle and killing everyone building it.The first fusion atomic bomb (commonly called a hydrogen bomb) was tested in 1952 as Ivy Mike and had a 10 megaton yield. The highest yield pure fission atomic bomb ever built was also tested in 1952 as Ivy King and had a 500 kilotons yield.
A 1 Megaton (million ton) nuclear warhead has the destructive power of 1 million tons of TNT.The measurement comes from the use of TNT's explosive power in quantity. The Trinity test site at Alamogordo, New Mexico, prior to the first nuclear test, was calibrated using TNT prior to the main test.
They are both the same thing.
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The largest megaton bomb ever detonated was the Soviet Union's Tsar Bomba in 1961, with a yield of about 50 megatons. It was the most powerful nuclear weapon ever created and tested.
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The 50 Megaton "Tsar Bomba" hydrogen bomb tested by the USSR in 1961 is the strongest hydrogen bomb ever detonated. The 10 Megaton "Ivy Mike" hydrogen bomb tested by the U.S. in 1952 is the physically largest hydrogen bomb ever detonated.
There are many differences, one is that it is impossible to build a pure fission atomic bomb with a yield above 1 megaton (the largest tested was 500 kilotons, half the limit) while there is no limit on the yield that a hydrogen bomb can produce. The difference in mechanism is that an atomic bomb gets all of its yield from fission of heavy isotopes (e.g. plutonium-239, uranium-235, uranium-233) while a hydrogen bomb gets a significant amount of its yield from fusion of isotopes of the light element hydrogen (deuterium and tritium).
There is no "nominal" atomic bomb, their yields can vary from less than 100 tons TNT equivalent to nearly 1 megaton TNT equivalent. Therefore there is no single meaningful answer to this question. Hydrogen bombs have no upper limit for yield!
If you consider the US atomic bomb is a Christian bomb, the French atomic bomb is also Christian bomb and so on, then you can name the Pakistani atomic bomb an Islamic bomb.
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