Which is more general purpose? By this I mean to ask that, which language touches more domains? For Example - Today i write kernel. Tommorow I write a gui app.

Which is more general purpose? By this I mean to ask that, which language touches more domains? For Example - Today i write kernel. Tommorow I write a gui app. The next day, a web backend, the very next day, a self aware neural type of thing. Which one single language suites me?