written vs longhand

written is not a noun while longhand is a noun.

Word	Noun	Adjective	Verb	Adverb
written	No	Yes	No	No
longhand	Yes	Yes	No	No

written (noun)	longhand (noun)
	rapid handwriting in which letters are set down in full and are cursively connected within words without lifting the writing implement from the paper

written (adjective)	longhand (adjective)
set down in writing in any of various ways	having words written out in full by hand
systematically collected and written down
written as for a film or play or broadcast