Had at can be replaced with different words depending on the context. It can be interchanged with phrases like possessed, owned, had in one's possession, or had hold of. Other synonyms for the term include acquired, gained, obtained, secured, or attained. These words connote the idea of having something under control or within reach. Had at can also be substituted with phrases like managed to get, got a hold of, or came into possession of, which imply some degree of effort or difficulty in obtaining what is being referred to. By using different synonyms for the phrase had at, a writer can effectively convey the intended meaning or tone of the sentence.