On the tool bar select INSERT then FIELD
On the Tools menu, click Options, and then click the Print tab. In the left hand box select DOCUMENT INFORMATION in the right hand box select NumWords this will insert the field on your page
On the Tools menu, click Options, and then click the Print tab.
Under Printing options, select the Update links check box.
Word updates any linked information before printing the document.
Let me know if this works OK for you