Scottish Gaelic Language - the Q-Celtic language spoken in Scotland today, and the language of the late Iron-Age/medieval Scots. In the medieval context, this should be understood as referring to the languages we know as the Middle Irish Language and the Old Irish Language
Scots Language - deriving from northern Middle English , this is a West Germanic language spoken in parts of Scotland, Northern Ireland, and Donegal, Ireland.
Scottish English - the group of dialects of the English language currently used in Scotland.