barricade vs block off

barricade is a noun but block off is not a noun.

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

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

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

As verbs, block off is a hyponym of barricade; that is, block off is a word with a more specific, narrower meaning than barricade:

Other hyponyms of barricade include close off, shut off, close.

barricade (noun)	block off (noun)
a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.
a barrier (usually thrown up hastily) to impede the advance of an enemy

barricade (verb)	block off (verb)
block off with barricades	obstruct access to
prevent access to by barricading	render unsuitable for passage
render unsuitable for passage	block off the passage through