We don't have synonyms for Avisco yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are aviso, visco and aviaco.
(n) :
A kind of dispatch boat or "advice boat", carrying orders before the development of effective remote communication; an advice boat, or dispatch boat.
(n) :
A kind of dispatch boat or "advice boat", carrying orders before the development of effective remote communication; an advice boat, or dispatch boat.