constrict vs throttle

constrict is not a noun while throttle is a noun.

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

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

constrict (verb)	throttle (verb)
become tight or as if tight	reduce the air supply
squeeze or press together	place limits on (extent or amount or access)
	kill by squeezing the throat of so as to cut off the air