Font Book is an application available to all accounts.
There are three Font folders (provided by OS X)
Contains fonts essential to the proper working of the OS and various included applications.
Contains the standard set of fonts provided with the OS version, and is where you should put any fonts that you want to be shared by all accounts
Is the folder in each account. Fonts in here will be available only to that account.
Log into your old account and transfer the fonts from
~/Library/Fonts to /Library/Fonts
"/" indicates the root (Macintosh HD), "~/" is shorthand for your user folder.