Vernacularity refers to the usage of language that is specific to a certain region or culture. Synonyms for this word could include dialect, jargon, or argot. These terms all describe language that is unique to a certain group of people or area, and may not be easily understood by outsiders. Another synonym for vernacularity is slang, which refers to informal language that is commonly used in a particular group or age range. Additionally, the term patois can be used to describe the vernacular speech of a specific social group or ethnic community. Overall, there are many words that can be used interchangeably with vernacularity to describe unique linguistic practices.