Nouns

(n)accelerator, throttle, throttle valvea valve that regulates the supply of fuel to the engine
(n)accelerator, accelerator pedal, gas pedal, gas, throttle, guna pedal that controls the throttle valve“he stepped on the gas”

Verbs

(v)restrict, trammel, limit, bound, confine, throttleplace limits on (extent or amount or access)“restrict the use of this parking lot”, “limit the time you can spend with your friends”
(v)strangle, strangulate, throttlekill by squeezing the throat of so as to cut off the air“he tried to strangulate his opponent”, “A man in Boston has been strangling several dozen prostitutes”
(v)choke, throttlereduce the air supply“choke a carburetor”