And then there are the strange-sounding words that feel like they've never quite done more than graft themselves onto the native stock of our langauge:

The Jeep was where I'd left it, looted but with enough gas in the tank to get me to a town. I managed to hot-wire it and drove away as fast as the surface would permit. I did not turn on the headlights. Fortunately there was a bright-yellow gibbous moon to light my way.

Ch 8, The Ground Beneath Her Feet, Salman Rushdie

So I guess my emmergent sub-theme would be about degrees of nativity or assimilation into the core language :)