Un-keyword? You've got me there, I think we should just make words up willy-nilly whenever we find a lack.. So lockword or un-keyword would be like 'as in that, when, if?'
Pad,Lock.....Sash lock ,Door lock ,Rim lock ,Chubb Lock ,Yale Lock ,Big Lock ...The Lock of a canal ..The lock of a Dock... Owl many more do you need fore yaw home work....????