obstruct vs barricade

obstruct is not a noun while barricade is a noun.

Word	Noun	Adjective	Verb	Adverb
obstruct	No	No	Yes	No
barricade	Yes	No	Yes	No

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

obstruct (noun)	barricade (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

obstruct (verb)	barricade (verb)
block passage through	block off with barricades
shut out from view or get in the way so as to hide from sight	prevent access to by barricading
hinder or prevent the progress or accomplishment of	render unsuitable for passage