'Waker' definitions:

Definition of 'waker'

From: WordNet
noun
Someone who rouses others from sleep [syn: waker, rouser, arouser]
noun
A person who awakes; "an early waker"

Definition of 'Waker'

From: GCIDE
  • Waker \Wak"er\, n. One who wakes. [1913 Webster]