Super-secret is a term that is commonly used to describe something that is kept hidden or confidential. However, there are several other words that can be used as synonyms for this term. One of these words is classified, which refers to information that is kept confidential and only available to a select few. Another synonym for super-secret is clandestine, which is often used to describe covert or secretive operations. Other words that can be used include confidential, covert, hush-hush, and top secret. Whatever word is used, the end result is the same - something that is kept hidden or unknown to most people.