block out vs sketch

block out is not a noun while sketch is a noun.

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

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

Other hypernyms of block out include adumbrate, outline.

block out (noun)	sketch (noun)
	preliminary drawing for later elaboration
	short descriptive summary (of events)
	a humorous or satirical drawing published in a newspaper or magazine
	a brief literary description

block out (verb)	sketch (verb)
plan where and when songs should be inserted into a theatrical production, or plan a theatrical production in general	describe roughly or briefly or give the main points or summary of
indicate roughly	make a sketch of
shield from light
prevent from entering