block out vs close up

block out and close up both are verbs.

Word	Noun	Adjective	Verb	Adverb
block out	No	No	Yes	No
close up	No	No	Yes	Yes

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

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

block out (verb)	close up (verb)
plan where and when songs should be inserted into a theatrical production, or plan a theatrical production in general	refuse to talk or stop talking; fall silent
indicate roughly	block passage through
shield from light	unite or bring into contact or bring together the edges of
prevent from entering	cease to operate or cause to cease operating

block out (adverb)	close up (adverb)
	very close