One Word Substitution

DIRECTIONS : In each of the following questions, out of the four alternatives, choose the one which can be substituted for the given words/sentence.
1. A person who does not believe in any religion
  A.  Atheist
  B.  Rationalist
  C.  Pagan
  D.  Philatelist
2. A person who eats too much
  A. Omnivore
  B. Glutton
  C. Reveller
  D. Sensualist

3. Large scale departure of people
  A.  Migration
  B.  Emigration
  C.  Immigration
  D.  Exodus
4. The place where bricks are baked
  A.  Cemetery
  B.  Foundry
  C.  Mint
  D.  Kiln
5. An associate in an office or institution
  A.  Accomplice
  B.  Companion
  C.  Colleague
  D.  Ally