Anonymizer refers to a tool or system that enables internet users to browse the web or access other online services without disclosing their identities. However, there are several synonyms for the word, including anonymizing tool, cloak, obscuring software, anonymizing service, shield, among others. These synonyms describe different aspects of the concept of anonymity, and some may be more appropriate in certain contexts than others. For instance, the term shield may be applicable when referring to the protection of personal information from unauthorized access. On the other hand, the term cloak may suggest a more stealthy approach to anonymity that seeks to obscure all traces of identity.