Solutions Every two years has 11 entries with similar clues
- eonYears and years
- agesYears and years
- yonksYears and years
- yearlingA racecourse under two years old
- triennialRecurring every three years
- sexennialRecurring every six years
- decennialRecurring every ten years
- round-robinTournament in which every contestant plays against every other
- quadrennialRecurring every four years
- quinquennialRecurring every five years
- halleys-cometVisitor for every seventy-six years