mechanical device
airplane propeller
airscrew
prop
screw
screw propeller
variable-pitch propeller
propulsion
axle
brake
diesel
dynamo
elevator
fuselage
gear
generator
helicopter
jet
lever
motor
paddle
piston
pulley
pump
roller
rotor
rudder
torpedo
turbine
winch
Heller
Keller
Seller
Teller
Weller
bestseller
cellar
dweller
eller
feller
heller
interstellar
lamellar
meller
reseller
schneller
seller
sheller
speller
stellar
steller
teller