Anything you put in a table in Word can be sorted – alphabetically or numerically, ascending or descending (go to Table>Sort and click on the options).
But you can also use Word to sort things which aren’t in a table, by selecting a number of paragraphs and then using Table>Sort – it will give you the option to sort by paragraphs. It will rearrange the paragraphs according to the first letters of each. It’s probably the most counter-intuitive feature of Word, because it’s patently not a table that you’re sorting.
The most obvious use for this this would be if you’re sorting items in a bibliography, where the authors need to be listed alphabetically. I’d normally use Zotero for this, but if you have a manually generated list of books, Table>Sort is a great way to organize them.