Which tool is commonly used for word processing?

The choice of Microsoft Word as a commonly used tool for word processing is grounded in its primary function and design. Microsoft Word is specifically created for composing, editing, formatting, and managing text documents. It offers a range of features tailored to the needs of word processing, such as spell check, grammar correction, and various text formatting options, including fonts, style, and layout.

In contrast, other tools listed serve different purposes: Google Sheets and Microsoft Excel are primarily spreadsheet applications designed for data analysis and numerical calculations, making them unsuitable for word processing tasks. Microsoft PowerPoint is focused on creating presentations and slideshows, which involves graphic layout and display rather than text document management.

Thus, due to its specialized functionalities targeted at text and document creation, Microsoft Word stands out as the essential word processing tool.