There isn't much difference in these terms. Both refer to nuclear weapons, and they are general terms that can pretty much be used interchangeably.
Nuclear reactions in a nuclear reactor are controlled reactions. The reactions in the atomic bomb are not controlled reactions
An atomic bomb is a type of nuclear weapon that releases energy through nuclear fission (splitting of atomic nuclei). Nuclear weapon is a broader term that encompasses atomic bombs, as well as hydrogen bombs which release energy through nuclear fusion (combining atomic nuclei).
The terms "atomic bomb" and "nuclear bomb" are general terms and can pretty much be used interchangeably. That said, there isn't any difference between them, and one is not more powerful than the other in that light.
An atomic bomb is a complete deliverable bomb, including all nonnuclear components. The nuclear core is a rather small part, typically between 2 to 3 inches in diameter that contains the fissile fuel that when made supercritical by conventional explosives in the bomb fissions and provides the energy to drive the actual nuclear explosion.
The atomic bomb killed millions of people in just one bomb , the napalm on the other hand , was nothing like it . Napalm is a chemical device ... it produces fire (it's also called jellied gasoline). An atomic bomb is a nuclear device ... and puts out considerably more energy.
A nuclear bomb is any bomb with any nuclear or atomic material inside it, while a plutonium bomb is a specific type of nuclear bomb. Plutonium could be the nuclear material inside the bomb, and if it is, it's a plutonium bomb.
fission vs fusion
Atomic bombs are a type of Nuclear bomb and there are 2 types of nuclear bombs. The second type of nuclear bomb is a hydrogen bomb.
If you mean "atomic" as in the Atomic Bomb, then the word "nuclear" could be substituted = Nuclear Bomb.
18th May1998, but its not atomic bomb (its nuclear bomb)
A nuclear bomb or atomic bomb
The main difference is test devices often have no casing, but this may not be true as some tests were done with the full operational military bomb (e.g. Crossroads Able in 1946 was a test involving dropping a MK-III bomb identical to Fatman from a B-29 over Bikini Atoll).