Nu metal isnt strictly defined either  Im basically just transcribing what other people wrote on the subject and there is a distinction made bewteen the two  And no one ever called alternative metal uncommericalized metal  The neologism rule applies if we have coined the term ourselves which we havent it does not show up often in searches it shows up quite often and the term is not useful in Wikipedia it has been used frequently in other articles and the subject has been integrated into these articles in order to add to the description of these articles   But really spell out exactly what you think repeats in both articles so we can try to address those issues