There are several synonyms for the term "special messengers" that can be used based on the context of the situation. Some of the frequently used terms include envoys, emissaries, couriers, ambassadors, heralds, and intermediaries. These terms refer to individuals who are appointed to deliver important messages or information on behalf of a person or organization. Each of these synonyms has a slightly different connotation and usage depending on the situation. For example, an envoy or ambassador is often a formal representative of a government or organization sent to represent their interests in a foreign country, while a courier might be a simple messenger tasked with delivering packages.