1.  skulker(n = noun.person) malingerer, shammer - someone shirking their duty by feigning illness or incapacity; Array
is a kind of shirker, slacker
Derived form verb skulk₂

2.  skulker(n = noun.person) lurcher, lurker - someone waiting in concealment; Array
is a kind of waiter
Derived form verb skulk₁

   One who, or that which, skulks. [1913 Webster]