The word "facter" is not a recognized term in the English language. However, if we assume that you meant the word "factor," then some synonyms for this word include element, aspect, constituent, component, feature, and attribute. Each of these words denotes a part or piece of something that contributes to its overall makeup or functioning. In mathematical terms, a factor is a number that is multiplied by another number to obtain a product. Other related words to factor include influence, cause, and effect, which describe the relationship between two or more factors and their impact on a particular situation or outcome.