'Skulker' definitions:

Definition of 'skulker'

From: WordNet
noun
Someone shirking their duty by feigning illness or incapacity [syn: malingerer, skulker, shammer]
noun
Someone waiting in concealment [syn: lurker, skulker, lurcher]

Definition of 'Skulker'

From: GCIDE
  • Skulk \Skulk\, Skulker \Skulk"er\, n. One who, or that which, skulks. [1913 Webster]