zonk out vs black out

zonk out and black out both are verbs.

Word	Noun	Adjective	Verb	Adverb
zonk out	No	No	Yes	No
black out	No	No	Yes	No

As verbs, zonk out and black out are synonyms defined as:

zonk out and black out: lose consciousness due to a sudden trauma, for example

Other synonyms of zonk out include pass out.

zonk out (verb)	black out (verb)
fall asleep fast, as when one is extremely tired	lose consciousness due to a sudden trauma, for example
lose consciousness due to a sudden trauma, for example	suppress by censorship as for political reasons
	darken completely