filibuster vs obstruct

filibuster is a noun but obstruct is not a noun.

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

As verbs, obstruct is a hypernym of filibuster; that is, obstruct is a word with a broader meaning than filibuster:

Other hypernyms of filibuster include block, blockade, embarrass, hinder, stymie, stymy.

filibuster (noun)	obstruct (noun)
(law) a tactic for delaying or obstructing legislation by making long speeches
a legislator who gives long speeches in an effort to delay or obstruct legislation that he (or she) opposes

filibuster (verb)	obstruct (verb)
obstruct deliberately by delaying	block passage through
	shut out from view or get in the way so as to hide from sight
	hinder or prevent the progress or accomplishment of