Atomic bomb and Physics package

Atomic bomb noun - A nuclear weapon in which enormous energy is released by nuclear fission (splitting the nuclei of a heavy element like uranium 235 or plutonium 239).

Physics package and atomic bomb are semantically related. In some cases you can use "Physics package" instead a noun phrase "Atomic bomb".

Atomic bomb and physics package are semantically related. You can use "Atomic bomb" instead a noun phrase "Physics package".