"Prefactor" is a term that is commonly used in mathematical and scientific fields to refer to a numeric value that appears before a variable or a mathematical expression. However, in order to avoid repetition and add variety to your writing, it is important to have a range of synonyms for this term. Here are some possible alternative words that you could use instead of "prefactor": coefficient, constant, factor, multiplier, parameter, scalar. These words essentially refer to the same concept as "prefactor" and could be used interchangeably depending on the context and the specific field of study. Using a variety of synonyms can make your writing more engaging and interesting to read.