This console command opens up the Compound Node Editor/Node Graph tool. Use the X button at the top right of the window to close (typing this command again just opens up another window under it).
The syntax for the compoundnodeeditor command is as follows:
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Find below working examples of the compoundnodeeditor command.
This is the only way the compoundnodeeditor command can be used, note that it isn't a toggle command.