| 100% | FIRE | 4 | Trigger for a sprinkler system |
| 55% | MOON | 4 | Trigger for a werewolf's transformation |
| 55% | LAWN | 4 | Place for a sprinkler |
| 54% | ONATIMER | 8 | Like a sprinkler system, often |
| 54% | TOE | 3 | Possible trigger for a podophobe |
| 53% | HOSE | 4 | Source of water for a sprinkler |
| 52% | ISM | 3 | Suffix for a belief system |
| 49% | REFORMAT | 8 | Initialize for a different operating system |
| 49% | ASL | 3 | Initials for a visual communication system |
| 48% | ISM | 3 | Suffix for a system, philosophy, ideology etc |
| 47% | AUTO | 4 | Prefix with "pilot" for a aircraft-controlling system |
| 47% | BMT | 3 | Subway sub named for a former subway system |
| 46% | EXHAUST | 7 | System for venting gas from a car |
| 46% | AERATION | 8 | System for adding air to a pond |
| 46% | CALC | 4 | Trig may be a prerequisite for it |
| 45% | ROADMAP | 7 | Reference guide for a driver with no navigation system: 2 wds. |
| 44% | HEATING | 7 | Warming system for a house |
| 43% | GIVENOTICE | 10 | Trigger a search for a replacement |
| 43% | FENGSHUI | 8 | Chinese system for placing objects in a room |
| 43% | RECKONING | 9 | Dead __, system for determining position of a ship |
| 43% | ASCII | 5 | American code system for text in a computer |
| 43% | DIGESTIVE | 9 | System of organs for food in and out of a body |
| 43% | SLR | 3 | Camera with a mirror-and-prism system, for short |
| 43% | RHESUS | 6 | Animal for which a blood-group system is named |
| 43% | BRAILLE | 7 | Writing system you need to get a feel for? |
| 42% | GAMIFY | 6 | Create a point system for, e.g. |
| 42% | RATING | 6 | A grading system for a film's content like PG or R |
| 42% | ASL | 3 | System in which "time" is a tap on the wrist, for short |
| 40% | OTIS | 4 | Inventor of a braking system for cars |
| 40% | DEWEY | 5 | Melvil —, US inventor of a system for the classification of library books |