longhand vs written

longhand is a noun but written is not a noun.

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

longhand (noun)	written (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

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