| Answer | Crossword Clue |
|---|---|
| resojet | a pulsejet (a type of engine) |
| resojets | RESOJET, a pulsejet (a type of engine) |
| pulsejets | PULSEJET, a type of engine |
| pulsojet | pulsejet (a type of engine) |
| pulsojets | PULSOJET, pulsejet (a type of engine) |
| steamboats | A boat that is propelled by a steam engine, esp. a paddle-wheel craft of a type used widely on rivers in the 19th century |
