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

• seamless
• seamlessly
• sea monster
• sea monsters
• sea moss
• sea mosses
• seamount
• seamounts
• sea mouse
• seams
• seamset
• seamsets
• seamster
• seamsters
• seamstress
• seamstresses
• seamstressies
• seamstressy
• seam welding
• seamy
• seamy side
• seamy sides
• sean
• Seanad
• Seanad Eireann