The word "simous" is a rarely used adjective that describes a feature characterized by having a flat or wide nose. Although synonyms for this word may not be commonly used either, there are some alternatives that can be used to describe a similar feature. For instance, "platyrhine" is a medical term that refers to a flat or wide nose, while "rhinoplasty" describes a surgical procedure that alters the shape of the nose. "Pug-nosed," "snub-nosed," and "button-nosed" are also potential options that can describe a nose with a flattened appearance. However, it's important to note that these synonyms may have slightly different connotations and meanings, so it's crucial to use them in the appropriate context.