encumber vs throttle

encumber is not a noun while throttle is a noun.

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

As verbs, throttle is a hypernym of encumber; that is, throttle is a word with a broader meaning than encumber:

encumber: restrict (someone or something) so as to make free movement difficult
throttle: place limits on (extent or amount or access)

Other hypernyms of encumber include bound, confine, limit, restrict, trammel.

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

encumber (verb)	throttle (verb)
restrict (someone or something) so as to make free movement difficult	reduce the air supply
	place limits on (extent or amount or access)
	kill by squeezing the throat of so as to cut off the air