Chronolect vs. Lect
Chronolectnoun
A specific variety of a language at a given time in its history of development.
Chronolect
In linguistics, a chronolect or temporal dialect is a specific speech variety whose characteristics are in particular determined by time-related factors. As such, it can be contrasted with a sociolect, an ethnolect or a geolect.
Lectnoun
A specific form of a language or language cluster: a language or a dialect.
