Nucleon numbers are synonymous with atomic mass, mass number, and isotopic mass. Atomic mass refers to the average mass of an element's atoms, taking into account the relative abundance of each isotope. Mass number is the sum of protons and neutrons in an atom's nucleus, while isotopic mass refers to the mass of a specific isotope. These synonyms are important in nuclear physics as they describe the composition and stability of atomic nuclei. Understanding nucleon numbers is crucial in numerous fields, including medicine, agriculture, and energy. By using these various synonyms, scientists can accurately describe the atomic makeup of different elements and isotopes.