All three of the fonts appear in Font Book, and in Pages - but only one of them appears on the font list in Word, PowerPoint and Excel.
This is an extremely common issue with Font Book. Apple should trash this font manager and start over with it. Whenever Font Book's database gets damaged, and that happens with incredible ease, you see things like this. Fonts won't appear that you've activated, will in some apps but not others, you can't add fonts to Font Book or turn others off, etc.
Restart your Mac and immediately hold down the Shift key when you hear the startup chime to boot into Safe Mode. Keep holding the Shift key until OS X asks you to log in (you will get this screen on a Safe Mode boot even if your Mac is set to automatically log in). Let the Mac finish booting to the desktop and then restart normally.
This will clear Font Book's database and the cache files of the user account you logged into in Safe Mode. In Leopard or earlier, any font sets you have created will be gone. Also, all fonts in the three main Fonts folders (System, Library, your user account) will now be active, regardless of their state beforehand. In Snow Leopard, your sets will remain intact. Don't start Font Book yet.
You also want to clear out all other remaining font cache files.
Close all running applications. From an administrator account, open the Terminal app and enter the following command. You can also copy/paste it from here into the Terminal window:
sudo atsutil databases -remove
Terminal will then ask for you to enter your admin password. As you type, it will not show anything, so be sure to enter it correctly. Press Enter.
This removes all system and user font cache files. Both for the system and all user font cache files. After running the command, close Terminal and immediately restart your Mac.
Now you need to clear the font cache files for Office. Close all Office applications. Remove the following files. The tilde (~) indicates your home account.
~/Library/Preferences/Microsoft/Office Font Cache (11)
For Office 2008, the location of the second item is:
~/Library/Preferences/Microsoft/Office 2008/Office Font Cache (12)
For Office 2011, the location is:
~/Library/Preferences/Microsoft/Office 2011/Office Font Cache
That takes care of everything except for launching Font Book so it can build a new database.