Amazon Kindle Fire - Search for a word in an eBook

To search for a word inside an eBook, there are two ways:

The first is obvious. Just press the search / magnify glass icon at the bottom of the book you are reading.

The second is slightly less obvious. Open a book, then press and hold on a word in the book. A menu will appear. Then press More and Search in book. This will show all locations in the book where that word occurs.