The translation "nihilism" when found in Buddhism merely refers to a denial of or disbelief in the efficacy of kamma, the denial of morality and the denial of causality. The words for this in Pali are natthikavāda, akiriyavāda and ahetukavāda. Refer to MN 60. In other words, there appears to be no term translated as "nihilims""nihilism" in Buddhism that refers to "nothing is real".