You can print labels from Microsoft Word by using the Mailings tab. There, the Labels dialog box has hundreds of label templates to choose from.

Avery develops sheets of return address labels that you can print to from a computer. ... Download the return address label template that corresponds to the product number on your Avery label box.

While you could tediously copy and paste names and addresses from a text document, with a little know-how in Excel, you can make the process far easier.