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When you type in a document, Word automatically counts the number of pages and words in your document and displays them on the status bar at the bottom of the workspace.
If you don't see the word count in the status bar, right-click the status bar, then and click Word Count.
You can count the number of words in a selection or selections, rather than all of the words in a document. The selections don't need to be next to each other for you to count them.
The status bar displays the number of words in the selection. For example, 321/1570 means that the selection accounts for 321 words of the total number of words in the document, 1,570.
The status bar displays the number of words in the text box. For example, 240/990 means that the text box contains 240 words of the total number of words in the document, 990.
The Word Count dialog box displays the number of pages, paragraphs, and lines in your document, and also the number of characters, either including or excluding spaces.
For more about Microsoft Word 2016 in detail, Read More Here