Atomic cannons are heavy guns that were developed during World War II to fire atomic shells. Synonyms for atomic cannons could include nuclear artillery, radiation artillery, or atomic artillery. These terms all refer to the same type of weapon, which was designed to deliver a devastating payload of radioactive material to enemy targets. Other potential synonyms could include atomic howitzers or fission guns, each of which emphasizes a particular aspect of the technology. Overall, the term "atomic cannon" remains the most widely recognized name for this type of weapon, despite the development of more modern and efficient technologies for delivering nuclear payloads.