brownout vs blackout

brownout and blackout both are nouns.

Word	Noun	Adjective	Verb	Adverb
brownout	Yes	No	No	No
blackout	Yes	No	No	No

As nouns, brownout and blackout are synonyms defined as:

brownout and blackout: darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)

Other synonyms of brownout include dimout.

brownout (noun)	blackout (noun)
darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft)	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