In the Constitution of India, the word `Federal` is not used.

Let`s analyze each option to understand why it is not used:

1. The Preamble: The Preamble of the Constitution states the basic principles and objectives of the Indian Constitution. While it mentions terms like `Sovereign`, `Socialist`, `Secular`, `Democratic`, and `Republic`, it does not mention the word `Federal`. Therefore, option 1 is incorrect.

2. Part III: Part III of the Constitution deals with Fundamental Rights. Although the concept of federalism is an important aspect for safeguarding fundamental rights, the word `Federal` is not directly mentioned in this part. So, option 2 is also incorrect.

3. Article 36S: There is no provision or article in the Constitution of India with the number `36S`. This option is not valid and is incorrect.

4. Nowhere: As mentioned earlier, the word `Federal` is not used in the Indian Constitution. Therefore, option 4 is the correct answer.

In conclusion, the word `Federal` is not used in the Constitution of India, making option 4 the correct answer.