restrict vs throttle

restrict is not a noun while throttle is a noun.

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

As verbs, restrict and throttle are synonyms defined as:

Other synonyms of restrict include bound, confine, limit, trammel.

restrict (noun)	throttle (noun)
	a valve that regulates the supply of fuel to the engine
	a pedal that controls the throttle valve

restrict (verb)	throttle (verb)
place limits on (extent or amount or access)	reduce the air supply
place restrictions on	place limits on (extent or amount or access)
place under restrictions; limit access to by law	kill by squeezing the throat of so as to cut off the air
prevent (information) from being circulated or disclosed