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

• by-goings
• bygone
• bygones
• by half
• by halves
• by hand
• by heart
• by hook or by crook
• by inches
• by itself
• by Jove
• byke
• byked
• bykes
• byking
• bylander
• by-lane
• by-lanes
• bylaw
• bylaws
• by leaps and bounds
• byline
• bylines
• by little and little
• bylive