When it comes to opening letters, there are a variety of utensils that can be employed to get the job done. While the term "letter opener" is a commonly used phrase, there are many other options available. For instance, you could refer to a letter opener as a paper knife, a mail slitter, or a paper cutter. Other possible synonyms might include an envelope opener, a snail mail slicer, or even a document decrypter. Whatever terminology you use, the goal of these instruments is the same: to slice through the envelope and make its contents accessible.