A hook ladder is a type of ladder that is designed to hook onto a window sill or other horizontal surface. This type of ladder is often used by firefighters and rescue workers to gain access to buildings or other structures. Some synonyms for hook ladder include: 1. Window ladder 2. Hook and ladder 3. Rescue ladder 4. Extension ladder with hooks 5. Fire escape ladder 6. Emergency ladder 7. Rooftop ladder 8. Portable ladder with hooks 9. Multipurpose ladder with hooks 10. Multi-position ladder with hooks.