Word's Review, Compare, Combine command merges revisions from an original document and a reviewed copy. Microsoft's guide describes selecting both files and labeling unmarked changes so the contributor can be identified. Additional options control how differences are handled.

Combine Review Copies into a Separate Word Document

Choose New document for the combined result when preserving the input files is useful. The review interface then shows revisions alongside the merged document, giving the editor a clearer basis for working through returned feedback.