Related by context. Frequent words. (Click for all words.) 59 rotors 57 rotor blades 55 propellers 55 propeller blades 52 propeller 52 flapping wings 49 stick shaker 48 rotor 48 sonic boom 48 turbine blades 47 jet engines 47 whooshing 46 whoosh 46 tail rotor 46 whooshing sound 46 whirr 45 billowing clouds 45 updrafts 45 mm cannon 45 whirling 45 supersonic speed 45 spinning blades 44 propellor 44 subsonic 44 biplanes 44 staccato 44 airspeed 44 loud booms 44 tires screeching 43 planes 43 thunderclouds 43 Helicopter gunships 43 midair 43 vibrations 43 vortices 43 aircraft 43 hovered overhead 43 screeching tires 43 supersonic speeds 43 lightning flashes 42 choppers 42 airplanes 42 Loud explosions 42 chopper 42 sonic booms 42 rumbling noise 42 treetops 42 vanes 42 tires squealing 41 loud noise 41 muzzle flashes 41 Fierce winds 41 helicopters 41 dull thud 41 ash plumes 41 engines 41 airplane 41 airfoil 41 jets 41 rotor blade 41 plane 41 loud thump 41 screeching 40 centrifugal force 40 propeller driven 40 waterspouts 40 Gusting winds 40 dust devils 40 undercarriage 40 scramjet 40 thunderstorm 40 howling wind 40 helicopter 40 #mm cannon [001] 40 blades 40 combustion chambers 40 copters 40 Cobra helicopters 40 chirping birds 40 hissing sound 39 whirlwinds 39 swooshing 39 whir 39 Wind shear 39 thunderheads 39 Cessna 39 crop dusters 39 strobe light 39 whirring 39 Apache helicopter gunships 39 pulsations 39 nozzles 39 afterburner 39 bullets whizzing 39 hang glider 39 aircrafts 39 laser beams 39 wing flaps 39 takeoff 39 landing gear 39 screech