You can carry Word on a USB drive if you have a Microsoft 365 subscription:
If you need a full-featured, offline word processor that fits on a USB stick, is the industry standard. It is a fork of OpenOffice, maintained by The Document Foundation. Microsoft Office Word Portable Download
Since Microsoft doesn’t make one, every "Word Portable" download link you find online is unauthorized software. Downloading and using these files carries substantial risks that often outweigh the benefit of convenience. You can carry Word on a USB drive