The word "goniometrical" is related to the measurement of angles and is often used in mathematical or scientific discussions. However, there are several other terms that can be used as synonyms for this word. Some possible options include geometric, angular, trigonometric, and angle-measuring. Each of these terms describes the act of measuring or calculating angles, either in a theoretical or practical context. Depending on the specific context of the conversation or writing, any of these words can be used interchangeably with "goniometrical" to add variety and clarity to the language used.