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

• unexplored
• unexposed
• unexpressed
• unexpressible
• unexpressive
• unexpugnable
• unexpurgated
• unextended
• unextenuated
• unextinct
• unextinguishable
• unextinguishably
• unextinguished
• unextreme
• uneyed
• unfabled
• unfact
• unfacts
• unfadable
• unfaded
• unfading
• unfadingly
• unfadingness
• unfadingnesses
• unfailing