Miscellaneous topics that do not fit into specific categories.
Open Word.
Select the Layout tab on the top menu, then click Size.
What size page is indicated as setup in Word?
Then on your printer, is that the same size as the paper you have inserted into your printer?
If the two sizes are the same, choose to printer the document and ensure there is no scaling setting or fit to page setting enabled and the document should print the correct size.