1) Eater 2) Feeder 3) Hungry eater 1) Eater 
In certain religions and mythologies, a devourer is a powerful destructive entity, such as Satan or Boreas (the North Wind in Greek mythology). Devourers are typically associated with death, either by devouring the living (thereby killing them) or by devouring the dead. ...
• (n.) One who, or that which, devours.
De·vour'er noun One who, or that which, devours. 
[n] - someone who eats greedily or voraciously
noun someone who eats greedily or voraciously