In NetSuite, Administrator who has control on everthing in his organization. when it comes to "Full Access" we can observe sligh difference between each.
Below are the pages and tasks that are available only for the Administrator role where as "Full Access" cannot
Under Setup > Company
Under Setup > Accounting
Under Setup > Import/Export
Also:
1. Employee records with Administrator role can only be edited by another administrator.
2. Only the administrators can edit all private and public saved searches, regardless of the search owner.