I'll avoid the obvious question of why? but to answer your question, you can't. They're fundamentally different. PM is bespoke page layout, made up of lots of separate text boxes and images - it's not a continuous stream of text like a typewriter, i.e. Word.
You can export the text from PM, box by box, in a couple of common formats for putting into Word, and you can copy the images one by one at your own risk, though it's much better practice to find the originals and insert them into Word. Do not put your trust into the windows clipboard.
1. Write your Pagemaker file to PDF
2. Save the PDF file as a Word document.
May not be ONE stroke, but close enough