What is another word for fissions?
Pronunciation: [fˈɪʃənz] (IPA) 
Fissions are the splitting of an atom into smaller nuclei, and there are a few synonyms that you can use to describe this process. For one, you can use the term "nuclear division" to refer to fissions. Another term that you can use is "atomic disintegration," which conveys the idea of the atom breaking apart. A third synonym for fissions is "nuclear fragmentation," which describes the splitting of the atom into smaller pieces. Finally, "atomic cleavage" is another term that can be used, and it emphasizes the breaking apart of the atom's structure. All of these synonyms convey the idea of the fission process in slightly different ways, but they all describe the same essential action.
