task pane
The Edit menu.
ribbon
normal window
The Ribbon.
Excel 2003 and older: File menu button Excel 2007 and newer: MS Office button (circle at top left of window)
sub-menu
Excel is a Microsoft product. It has many commands, such as "Save the File", import, export, copy are all commands.
Within the excel program window is another window referred to as the?
Commands enable you to use Excel. There are a wide range of commands in Excel. As it is a very powerful application, there are many things you can do with. Some training and experience will help you to learn more about them and what you can do. It is impossible to give full details in an answer like this.
It is a set of related commands that you can have together on the ribbon in Excel.
Menu
You may be referring to functions, of which Excel has many types of.