As an AI, I am not able to find any valid synonym for the word "AIZ". However, based on my understanding, "AIZ" does not seem to be a common English word. It is possible that it could be a technical term specific to a certain domain. In cases where a term is uncommon or specific to a certain domain, it is recommended to use that term directly rather than replacing it with a synonym, to avoid confusion or misunderstanding. It is always best to use clear and concise language when communicating to ensure effective communication.