Explanation:

- The word "Discover" means to find something that was not known before or to learn about something for the first time.

- Option 1: "Shut" – This means to close something, such as a door or lid. It doesn't relate to finding or learning.

- Option 2: "Close" – Similar to "shut," it refers to closing an object or space. It doesn't fit as a synonym for discover.

- Option 3: "Find" – This means to come upon something by searching or unexpectedly, perfectly aligning with the concept of discovery.

- Option 4: "Search" – It refers to looking for something. While related, it describes the action before a discovery is made.