whiteout vs white-out

whiteout is a noun but white-out is not a noun.

Word	Noun	Adjective	Verb	Adverb
whiteout	Yes	No	Yes	No
white-out	No	No	Yes	No

As verbs, whiteout and white-out are synonyms defined as:

whiteout and white-out: lose daylight visibility in heavy fog, snow, or rain

whiteout (noun)	white-out (noun)
an arctic atmospheric condition with clouds over snow produce a uniform whiteness and objects are difficult to see; occurs when the light reflected off the snow equals the light coming through the clouds

whiteout (verb)	white-out (verb)
lose daylight visibility in heavy fog, snow, or rain	lose daylight visibility in heavy fog, snow, or rain
cover up with a liquid correction fluid