Forum:Help! Nethack does not recognize mind flayer for scroll of genocide

I have 2 blessed scrolls of genocide, and I try to enter in "mind flayer", "mind flayers", "mindflayer", "mindflayers", "master mind flayer", "master mindflayer", "master mind flayers", "master mindflayers" and nethack does not recognize any of these. What do I need to do to get rid of mindflayers? And I am a dwarf, so h is out.