block out vs impede

block out and impede both are verbs.

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

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

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

block out (verb)	impede (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	be a hindrance or obstacle to
shield from light
prevent from entering