WordRel.com

• a valve that regulates the supply of fuel to the engine

  synonym	throttlethrottle valve
  derivation	accelerate
  holo part	fuel system
  hypernym	valve

• a scientific instrument that increases the kinetic energy of charged particles

  synonym	atom smasherparticle accelerator
  hypernym	scientific instrument
  hyponym	betatroncharge-exchange acceleratorCockcroft and Walton acceleratorCockcroft and Walton voltage multiplierCockcroft-Walton acceleratorCockcroft-Walton voltage multipliercollidercyclotroninduction acceleratorlinaclinear accelerator
  mero part	storage ring

• a pedal that controls the throttle valve

  synonym	accelerator pedalgasgas pedalgunthrottle
  derivation	accelerate
  holo part	aeroplaneairplaneautoautomobilecarmachinemotorcarplane
  hypernym	foot leverfoot pedalpedaltreadle

• (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

  synonym	catalyst
  domain topic	chemical sciencechemistry
  hypernym	activator
  hyponym	biocatalystenzymeplatinum black