You need a Word mail-merge main document whose database comes from your query, then you need a macro in Access which simply opens that document, whereupon Word will execute the query. So most of the work has to be done in Word.
Open your Word document, or create a new one. Go to the Mailings ribbon and click on Start Mail Merge to choose the type (Normal kills all mail-merging, and Step By Step option shows the old Word 2003 wizard). Next, click Select Recipients and choose Use Existing List -- here's where you'll point to your query: drop down the button that says All Data Sources, choose Access Databases or Access 2007 Database, whichever is appropriate, navigate to your Access database, Open it, and you'll see a list of all its tables and queries ("VIEW"s), so pick the one you want.
Now you're back at the main document, so you have to type text and occasionally click the Insert Merge Field button, whose list will contain your query's fields, to put a query-data field into the main document. Save this main document, and back in Access, create a macro than opens it. When the user runs the macro, they'll just have to click Finish & Merge on the Mailings ribbon.