pass out vs black out

pass out and black out both are verbs.

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

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

pass out: pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain
black out: lose consciousness due to a sudden trauma, for example

Other hypernyms of pass out include pass out, zonk out.

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

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

Other synonyms of pass out include zonk out.

pass out (verb)	black out (verb)
pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain	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
give to several people	darken completely