When it comes to protecting your investments, having interest insured can provide peace of mind. However, there are several synonyms for the term that describes this type of protection. Some alternatives include guaranteed interest, insured returns, protected principal, and capital assurance. These terms all refer to the same concept of providing a level of insurance coverage for an individual's financial investments. It's important to note that different financial products may offer different levels of interest insured, so it's always important to read the fine print and understand the terms and conditions of any investment before making a decision.