• 筆箱ふでばこ — pencil case
• 毛筆もうひつ — writing brush
• 筆記ひっき — writing / note-taking
• 筆者ひっしゃ — author
• 筆跡ひっせき — handwriting
• 万年筆まんねんひつ — fountain pen
• 代筆だいひつ — writing on behalf of someone

The kanji 筆 combines the bamboo radical ⺮ and the component 聿, which refers to brush-making tools. It originally described a writing brush made from bamboo and animal hair. By extension, 筆 came to represent writing itself, handwriting, and the role of an author.