block out vs obstruct

block out and obstruct both are verbs.

Word	Noun	Adjective	Verb	Adverb
block out	No	No	Yes	No
obstruct	No	No	Yes	No

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

Other hypernyms of block out include block, close up, impede, jam, obturate, occlude.

block out (verb)	obstruct (verb)
plan where and when songs should be inserted into a theatrical production, or plan a theatrical production in general	block passage through
indicate roughly	shut out from view or get in the way so as to hide from sight
shield from light	hinder or prevent the progress or accomplishment of
prevent from entering