For some reason, if you want to remove the header and/or the footer from your Word document, follow the steps below.
Please note, for this method to work, your document must contain a header and/or a footer.
How to Delete a Header in Word
Step #1: Open the Document
Open Word. Click on Open on the left side and locate your document using any of the methods Word offers—Recent, OneDrive, This PC, or Browse.

Step 2 : Check for Header and Footer
The opened document must show the header and the footer. There may or may not be text in the body of the document.

Step #3: Go to the Toolbar
From the toolbar on the top, click on Insert. The ribbon will change to show the Insert Menu.
Step #4: Delete the Header.
This will drop a menu with many selections. Go to the bottom of the menu and click on Remove Header. Word will remove the header and return you to the body of the document.

Final Document
This is how the final document will look with the header removed. Take note that the footer is still visible as we have not removed it.

How to Delete a Footer in Word
Deleting the footer is same as removing the header. Here are the steps for the same.
Step #1 : Go to the Toolbar
From the toolbar on the top, click on Insert. The ribbon will change to show the Insert Menu.
Step #2: Delete the Footer.
Go to the bottom of the menu and click on Remove Footer. Word will remove the footer and return you to the body of the document.

Final Document without the footer.
This is how the final document will look with Both Footer and Header removed.

Conclusion
Deleting a header and a footer from a document takes only five easy steps. It is possible to remove the header and footer independently and in any order.
Check out this tutorial for How to add header and footer in word