| 100% | SCHENGEN | 8 | Group of European nations with open mutual borders |
| 42% | SCHENGEN | 8 | European area with no checks at mutual borders |
| 41% | BLOC | 4 | Group of parties or nations with a shared purpose |
| 37% | MALTA | 5 | European island nation with a population of around 500,000 |
| 36% | GAELIC | 6 | Group of European languages |
| 36% | AQUA | 4 | European pop group with the 1997 hit "Barbie Girl," or a shade of blue |
| 35% | BLOC | 4 | Group of nations |
| 34% | UKRAINE | 7 | European nation with half-blue, half-yellow flag |
| 34% | BRIC | 4 | Group of developing nations |
| 34% | ICELAND | 7 | European nation with about eight people per square mile |
| 34% | ANDORRA | 7 | Tiny European nation with cattle on flag |
| 34% | UNION | 5 | European ___ (group of 27 nations) |
| 33% | AVES | 4 | Group of vertebrates with wings |
| 33% | OPEC | 4 | Group of oil-producing nations (Abbr.) |
| 33% | OPEC | 4 | Group of oil producing nations: Abbr. |
| 33% | OPEC | 4 | Group of oil-producing nations: Abbr. |
| 33% | OPEC | 4 | Group of oil-rich nations: Abbr. |
| 33% | IRE | 3 | European nation west of England (Abbr.) |
| 33% | BRASSBAND | 9 | Group of musicians with metal instruments |
| 33% | BLOC | 4 | Group of states with common interests |
| 32% | ANDORRA | 7 | Tiny European nation with two cows on its flag |
| 32% | VIKINGS | 7 | First group of Europeans to colonize the New World |
| 32% | OPEC | 4 | Group of nations that produce 21a: Abbr. |
| 32% | OPEC | 4 | Group of 12 oil-producing nations: Abbr. |
| 32% | OPEC | 4 | Group of 14 oil-producing nations: Abbr. |
| 32% | OPEC | 4 | Group of crude oil-producing nations: Abbr. |
| 32% | OPEC | 4 | Group of 13 oil-producing nations: Abbr. |
| 32% | SECT | 4 | Group of people with different religious beliefs |
| 32% | NETWORK | 7 | Group of people with a common interest |
| 32% | BLOC | 4 | Group of people with a common interest |