barricade vs block up

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

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

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

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

barricade (noun)	block up (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 up (verb)
block off with barricades	render unsuitable for passage
prevent access to by barricading
render unsuitable for passage