| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Piston Engine | 13 | 8 | 5 | 4 |
| Piston Rod | 10 | 7 | 3 | 3 |
| Piston Valve Engine | 19 | 12 | 7 | 5 |
| Plasma Engine | 13 | 8 | 5 | 4 |
| Plunger | 7 | 5 | 2 | 2 |
| Portable Engine | 15 | 9 | 6 | 4 |
| Powerhouse | 10 | 5 | 5 | 3 |
| Power Plant | 11 | 8 | 3 | 3 |
| Power Source | 12 | 7 | 5 | 3 |
| Power Station | 13 | 8 | 5 | 4 |
| Power Train | 11 | 7 | 4 | 3 |
| Propeller Jet Engine | 20 | 13 | 7 | 6 |
| Propjet | 7 | 5 | 2 | 2 |
| Pulse Jet Engine | 16 | 10 | 6 | 5 |
| Pumping Engine | 14 | 9 | 5 | 4 |
| Radial Engine | 13 | 7 | 6 | 5 |
| Railway Locomotive | 18 | 10 | 8 | 6 |
| Ramjet | 6 | 4 | 2 | 2 |
| Ramjet Engine | 13 | 8 | 5 | 4 |
| Reciprocating Engine | 20 | 12 | 8 | 7 |
| Refrigerating Engine | 20 | 12 | 8 | 7 |
| Repair | 6 | 3 | 3 | 2 |
| Reparation | 10 | 5 | 5 | 4 |
| Resojet Engine | 14 | 8 | 6 | 5 |
| Retort | 6 | 4 | 2 | 2 |
| Rocket | 6 | 4 | 2 | 2 |
| Rocket Engine | 13 | 8 | 5 | 4 |
| Rocket Motor | 12 | 8 | 4 | 4 |
| Rotary Engine | 13 | 8 | 5 | 4 |
| Rotary Piston Engine | 20 | 13 | 7 | 7 |
| Rotor Motor | 11 | 7 | 4 | 4 |
| Servomotor | 10 | 6 | 4 | 4 |
| Setup | 5 | 3 | 2 | 2 |
| Shunt Motor | 11 | 8 | 3 | 3 |
| Steam Boiler | 12 | 7 | 5 | 3 |

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