Hexadecapole is a term commonly used in physics and electromagnetism, referring to the fourth-order moment of a charge or current distribution. However, there are a few synonyms that can be used when discussing this concept, such as 16-pole, 4th rank tensor, or even simply "quadrupole squared". These terms all relate to the same mathematical concept of describing the distribution of charges or currents, but may be more accessible to those less familiar with scientific terminology. It's always helpful to have a range of vocabulary to describe complex concepts, and being able to use simpler synonyms can make these ideas more understandable for a wider audience.