rocket engine

noun 0.780

jet engine

noun 0.729

internal combustion engine

noun 0.698

air engine

noun 0.659

piston engine

noun 0.656

combustion engine

noun 0.646

engine

noun 0.646

heat engine

noun 0.645

traction engine

noun 0.631

rocket motor

noun 0.629

steam engine

noun 0.615

internal combustion

noun 0.612

reciprocating engine

noun 0.609

rotary engine

noun 0.600

nuclear rocket

noun 0.583

microengine

noun 0.581

engineman

noun 0.566

stationary engine

noun 0.566

two-stroke engine

noun 0.563

hybrid rocket

noun 0.563

graphics engine

noun 0.554

database engine

noun 0.551

engine room

noun 0.546

turbojet

noun 0.544

donkey engine

noun 0.542

siege engine

noun 0.540

storage engine

noun 0.536

specific impulse

noun 0.534

engine driver

noun 0.532

ignition

noun 0.522

engine block

noun 0.522

electric motor

noun 0.521

electron gun

noun 0.521

solid rocket

noun 0.520

fuel injection

noun 0.519

engine trouble

noun 0.513

search engine

noun 0.513

chemical engineer

noun 0.512

photoion

noun 0.510

inkjet

noun 0.509

rocket sled

noun 0.509

gas jet

noun 0.508

scramjet

noun 0.508

icer

noun 0.507

thruster

noun 0.504

injector

noun 0.504

igniter

noun 0.504

ejector

noun 0.503

hyperdrive

noun 0.502