Usually GUI applications are started through "launchers", i.e. .desktop files. You are seeing "Printing" in your menus instead of the real name because that is the "generic name" of the application (details in the link I posted). Depending on what DE you are using you might be able to right click on the menu entry and select
Properties which would allow you to see the executable path and sometimes the real name for that app. That's not possible in a DE like Gnome 3 so here is a solution that should work regardless of your DE.
.desktop files are located in
/usr/share/applications so simply
grep-ing for GenericName=Printing should list at least one launcher containing that string.
E.g. I don't have "Printing" on my system but I have "Text Editor". I want to know the real name of the application/executable so I run:
grep "GenericName=Text Editor" /usr/share/applications/*
So the "launcher" for "Text Editor" is
/usr/share/applications/gedit.desktop. Now, in order to know the real name and executable for "Text Editor" I have to grep the value of two keys:
grep -E '(^Name=|^Exec=)' /usr/share/applications/gedit.desktop
For the full path of the executable, it's only a matter or running:
and that returns: