"Letted have" is a phrase that means to allow someone to have or do something. There are many synonyms for this phrase, including permit, authorize, grant, enable, allow, sanction, and empower. Each of these words expresses the idea of giving someone the freedom or permission to do something. For example, if a teacher permits her students to use calculators during a test, she is letting them have the tools they need to succeed. Similarly, if a parent authorizes their child to go to a friend's house, they are letting them have the opportunity to socialize and have fun. Using synonyms for "letted have" can add variety and depth to your writing, and help you to express ideas more clearly.