treadle vs throttle

treadle and throttle both are nouns.

Word	Noun	Adjective	Verb	Adverb
treadle	Yes	No	Yes	No
throttle	Yes	No	Yes	No

As nouns, throttle is a hyponym of treadle; that is, throttle is a word with a more specific, narrower meaning than treadle:

treadle (noun)	throttle (noun)
a lever that is operated with the foot	a valve that regulates the supply of fuel to the engine
	a pedal that controls the throttle valve

treadle (verb)	throttle (verb)
operate (machinery) by a treadle	reduce the air supply
tread over	place limits on (extent or amount or access)
	kill by squeezing the throat of so as to cut off the air