Download WordService from
Devon Technologies, unzip (double-click) the file & then install it following the directions in the read me file. You will probably need to log out or restart your Mac for the services to be available. You will then have various options available under the Pages > Services menu. The various possibilities are dimmed in my screenshots because I have no text selected to apply the functions to.
For anyone using Snow Leopard, added services like WordService, will need to be "activated" in System Preferences > Keyboard > Keyboard Shortcuts.