What is another word for mail boat?
Pronunciation: [mˈe͡ɪl bˈə͡ʊt] (IPA) 
When it comes to synonyms for the term "mail boat", one could consider using alternative phrases such as "postal vessel" or "mail ship". Other potential terms might include "mail steamer", "mail ferry" or "mail barge". The specific choice of synonym could depend on contextual factors such as the size of the vessel, the frequency with which it delivers mail, or the nature of the waters it navigates. Ultimately, however, all of these terms refer to a mode of transport that facilitates the delivery of letters, packages and other correspondence between different locations, typically overseen by postal services or mail carriers.
