Here's how you can install Whisker Menu 1.4.0 in Fedora 20. Whisker Menu replaces the default menu in XFCE.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each:
sudo yum update
sudo yum install xfce4-whiskermenu-plugin
According to Linux G:
Whisker Menu is an innovative alternative for the XFCE default menu, including a modern search bar and enabling users to easily access all the installed apps from the system, or access applications by categories. It also remembers the last 10 used applications.More at Linux G
Additional resources for Whisker Menu
Additional Fedora Resources