I chose "quench" because:
1. It's 6 letters long (within 4-10 letter requirement)
2. It's a medium difficulty word - not used everyday but still familiar
3. Contains the uncommon letter 'q' which makes it interesting
4. Contains common letters like 'e' and 'n' to give the player some success
5. It's a regular English verb meaning "to satisfy thirst" or "to extinguish"
6. Contains no special characters, spaces, or hyphens