Give one word substitute:

The study about the cause and nature of diseases:

Our Chief Minister is a person of long experience in politics (Use one word for the words underlined). 

One who does not believe in  the existence of God is called an ---------

In the question, four words are given, one word is correctly spelt. Find the correctly spelt word and mark your answer.

In the question, four words are given, one word is correctly spelt. Find the correctly spelt word and mark your answer. 

In the question, four words are given, one word is correctly spelt. Find the correctly spelt word and mark your answer.