Operacion is a Spanish term that refers to an operation or surgical procedure. However, there are several synonymous words that can be used in place of operacion. For instance, the terms "cirugía" and "intervención quirúrgica" may also be used to describe surgical procedures. Additionally, the term "procedimiento" can be used to describe a medical operation that is carried out with precision and care. Furthermore, "tratamiento" can describe a medical operation that aims to cure a specific illness or condition, while "intervención medica" is a broader term that can be used to describe any medical procedure or intervention. Overall, there are several similar terms that can be used in place of operacion, each with their own nuances and connotations.