If you are using WordPress version 1.5 and have not updated to the recent version, then you may have some levels instead of these roles. There are levels from 0 to 10. Each level specifies some privilege. Let us see what these levels mean:
One who works at level 0 is a subscriber.
One who works at level 1 is a contributor.
One who works at level 2 to 4 is an author.
One who works at level 5 to 7 is an editor.
One who works at level 8 to 10 is an administrator.
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