what is word hunt in Subway

The Subway Surfers game keeps adding new challenges and missions for game lovers. The gamers complete these missions and challenges and get rewards of coins, keys, and boosters. There is also a challenge which is known word hunt or word tokens challenge. So, what is this challenge in Subway Surfers? Where you can find it? How you to complete this challenge.
This extension will help you to know what is word hunt in Subway Surfers, where to find it, and what kind of rewards you can win on completing word token challenge.