outliner

/ˈaʊtlaɪnər/
noun
  1. A person who creates an outline or plan for something, such as a document, project, or speech.
    • The outliner prepared a detailed plan for the conference schedule.
    • As an outliner, she helped the team organize their ideas before writing the report.
    • He worked as an outliner for a publishing company, structuring book chapters.
  2. A software tool or feature used to create and manage outlines.
    • The outliner lets you collapse and expand sections to focus on different parts.
    • This word processor has a built-in outliner for structuring documents.
    • I use an outliner app to organize my research notes.