The Collaborative International Dictionary of English v.0.48:
Headsman \Heads"man\ (h[e^]dz"man), n.; pl. Headsmen (-men). An executioner who cuts off heads. --Dryden. [1913 Webster]WordNet (r) 3.0 (2006):
headsman n 1: an executioner who beheads the condemned person [syn: headsman, headman]