A user can be in 3 groups with diverse rights in the database where the higher groups have all rights of lower groups in addition to special rights for this group, e.g. DiversityScientificTermsUser can only read the data of certain tables while DiversityScientificTermsEditor has the rights of DiversityScientificTermsUser and additionally can edit the data in certain tables - see overview below. 

Summarzied overview of the permissions of the groups
Group Permissions in addition to lower group
Administrator Grant access for users, insert and edit terminologies
Editor Create new entries and delete details (not whole datasets)
User See the data of the data tables