“The language or dialect spoken by the ordinary people in a particular country or region”
“The terminology used by people belonging to a specified group or engaging in a specialized activity” : gardening vernacular
Difference between “Vernacular” and “Dialect”:
When a New York City cab driver calls out the window, “Hey, wassa madda wichoo?” he is using the vernacular, which is the authentic, natural pattern of speech among those belonging to a certain community.In some areas of London, on the other hand, one might hear the Cockney dialect, which is a form or variety of a language that is confined to a specific group or locality; it has its own pronunciation, usage, and vocabulary, and may persist for generations or even centuries (: he spoke in the dialect of the Appalachian backwoodsman).