write out vs writing

write out is not a noun while writing is a noun.

Word	Noun	Adjective	Verb	Adverb
write out	No	No	Yes	No
writing	Yes	No	No	No

write out (noun)	writing (noun)
	the activity of putting something in written form
	the act of creating written works
	the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
	letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language
	(usually plural) the collected work of an author

write out (verb)	writing (verb)
make out and issue
put into writing; write in complete form