noun, noun or participle which takes 'suru'
letter to the editor; reader's letter; written complaint
A letter sent to a newspaper, magazine, or organization, often expressing an opinion or complaint. Can also refer to the act of sending such a letter.
新聞に投書を送った。
I sent a letter to the editor.
彼は市役所に苦情の投書をした
He wrote a letter of complaint to the city office.
noun, noun or participle which takes 'suru'
A manuscript or article submitted to a publication. Similar to 投稿, but 投書 often implies a letter or opinion piece rather than a general article.
See also: 投稿
雑誌に投書が掲載された。
My contribution was published in the magazine.