Related Clues:

• Energy, so to speak
• Riverboat propeller
• Cook, as broccoli
• Envelope opener
• Power source for Fulton
• Prepare some dim sum
• Prepare cappuccino milk
• Power for Robert Fulton
• Fulton's power source
• Vapour
• Cloudy, diffused matter
• Geyser's emission
• Power for Fulton
• Propellent for Casey Jones
• Iron horse power