blackout vs black out

blackout is a noun but black out is not a noun.

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

blackout (noun)	black out (noun)
a momentary loss of consciousness
partial or total loss of memory
the failure of electric power for a general region
darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)
a suspension of radio or tv broadcasting

blackout (verb)	black out (verb)
	lose consciousness due to a sudden trauma, for example
	suppress by censorship as for political reasons
	darken completely