Perhaps the linguistic terms of
variety or
lect would be a better fit:
https://en.wikipedia.org/wiki/Variety_(linguistics)
Variety: (linguistics) A specific form of a language, neutral to whether that form is an accent, dialect, register, etc., and to its prestige level; an isolect or lect.
Lect: (linguistics, sociolinguistics) A specific form of a language or language cluster: a language or a dialect.
Isolect: (linguistics) A language or dialect;
coined as a neutral term between ‘language’ and ‘dialect.’
Other synonyms:
code,
idiom,
languoid