What's the noun for dialectic? Here's the word you're looking for.
dialect
(linguistics) A variety of a language (specifically, often a spoken variety) that is characteristic of a particular area, community or group, often with relatively minor differences in vocabulary, style, spelling and pronunciation.
A dialect of a language perceived as substandard or wrong.
“German dialectology traditionally names the major dialect groups after Germanic tribes from which they were assumed to have descended.”
“In generative dialectology, the investigator holds that the language exists within the speaker as a competence which is never fully realized in performance.”
“Regarding the second principle, the lessons of historical linguistics and dialectology provide the strongest arguments available for the linguistic validity of U.S. Spanish.”