1. The diocese of an archbishop.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• archidiocese,
• archdioeces,
• archdioces,
• archdioses,
• archdiocesean,
• archdiocess,
• archdioceese,
• archiocese,
• archidocese,
• archdicoese,
• arcidiocese,
• archiocele,
• arckdiocese,
• archedocese,
• archdiocisive,
• archdiociese,
• archdiciese,
• archdeocese,
• archadocese,
• archidiosese

• archduchess,
• archducal,
• archdiocesan,
• archduke,
• archduchy,
• arecidae.

The adjective form of the word "archdiocese" is "archdiocesan".

The plural of the "archdiocese" can be the "archdioceses".

The singular of the "archdiocese" can be the "archdiocese".