interregnum /in-tər-regˈnəm/

1. The time between two reigns
2. The time between the cessation of one and the establishment of another government
3. Any breach of continuity in order, etc

• a chapter of accidents
• achar
• acharné
• achars
• acharya
• acharyas
• achates
• Achates
• ache
• ached
• achene
• achenes
• achenia
• achenial
• achenium
• acheniums
• Achernar
• Acheron
• Acherontic
• Acherontis pabulum
• aches
• Acheulean
• Acheulian
• achier
• achiest