書 （ショ） book, document, calligraphy (esp. Chinese), penmanship, handwriting, letter, note

書院 （ショイン） drawing room, study, writing alcove, publishing house

投書 （トウショ） letter (e.g. of complaint), letter to the editor, letter from a reader, contribution (to a newspaper, magazine, etc.)

議定書 （ギテイショ） protocol

書く （かく） to write, to compose, to pen, to draw, to paint