Nigger has come full circle too. From the more polite version 'negro'(sometimes disparaging spelt knee-groW) to 'nigga'.

Funny thing about 'nigga' it seems to have crossed racial lines into the realm of attitude.

I would never use it (nigga) but Im old.

As far as black as a Moor goes I don't think many people would even know what a Moor is, so maybe try submitting 'well-diggers arse' for Moor and really confuse 'em.