Document
noun
If you put writing into a category, you'd have to write it down after you've chosen what category it is in. Where would you write that down? Into a document, probably.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この書類は不びがあります。
This document is incomplete.
書類を家のつくえの上においてきてしまったっぽい!
I think the document is on my desk at home.
「いつトーフグの機密書類が欲しい?」「早ければ早いに越したことはないな。」
"When do you want Tofugu’s secret documents?" "The sooner, the better."