mark off vs throttle

mark off is not a noun while throttle is a noun.

Word	Noun	Adjective	Verb	Adverb
mark off	No	No	Yes	No
throttle	Yes	No	Yes	No

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

Other hypernyms of mark off include bound, confine, limit, restrict, trammel.

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

mark off (verb)	throttle (verb)
set boundaries to and delimit	reduce the air supply
put a check mark on or near or next to	place limits on (extent or amount or access)
	kill by squeezing the throat of so as to cut off the air