From The Collaborative International Dictionary of English v.0.48 :
mocassin \mocassin\ n.
Variant spelling of moccasin.
Syn: moccasin, moccasins.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
mocassin
n 1: soft leather shoe; originally worn by Native Americans
[syn: moccasin, mocassin]