block off vs stop

block off is not a noun while stop is a noun.

Word	Noun	Adjective	Verb	Adverb
block off	No	No	Yes	No
stop	Yes	No	Yes	No

As verbs, block off and stop are synonyms defined as:

Other synonyms of block off include bar, barricade, block, block up, blockade.

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

Other hypernyms of block off include bar, barricade, block, block off, block up, blockade.

block off (noun)	stop (noun)
	the act of stopping something
	a brief stay in the course of a journey
	a restraint that checks the motion of something
	an obstruction in a pipe or tube
	a mechanical device in a camera that controls size of aperture of the lens
	(music) a knob on an organ that is pulled to change the sound quality from the organ pipes
	a consonant produced by stopping the flow of air at some point and suddenly releasing it
	a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
	the event of something ending
	a spot where something halts or pauses
	the state of inactivity following an interruption

block off (verb)	stop (verb)
obstruct access to	prevent completion
render unsuitable for passage	stop and wait, as if awaiting further instructions or developments
block off the passage through	hold back, as of a danger or an enemy; check the expansion or influence of
	seize on its way
	render unsuitable for passage
	come to a halt, stop moving
	cause to end
	interrupt a trip
	stop from happening or developing
	put an end to a state or an activity
	have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical