The Collaborative International Dictionary of English v.0.48:
Mulla \Mul"la\, Mullah \Mul"lah\, n. Same as Mollah. [1913 Webster]WordNet (r) 3.0 (2006):
Mulla n 1: a Muslim trained in the doctrine and law of Islam; the head of a mosque [syn: Mullah, Mollah, Mulla]