| 100% | UNION | 5 | European ___ (group of 27 nations) |
| 81% | SCHENGEN | 8 | Group of European nations with open mutual borders |
| 67% | AMENDMENTS | 10 | Group of 27 in U.S. politics |
| 67% | BLOC | 4 | Group of nations |
| 66% | BRIC | 4 | Group of developing nations |
| 66% | GAELIC | 6 | Group of European languages |
| 64% | OPEC | 4 | Group of oil-producing nations (Abbr.) |
| 64% | OPEC | 4 | Group of oil producing nations: Abbr. |
| 64% | OPEC | 4 | Group of oil-producing nations: Abbr. |
| 64% | OPEC | 4 | Group of oil-rich nations: Abbr. |
| 63% | OPEC | 4 | Group of 12 oil-producing nations: Abbr. |
| 63% | OPEC | 4 | Group of 14 oil-producing nations: Abbr. |
| 63% | OPEC | 4 | Group of crude oil-producing nations: Abbr. |
| 63% | OPEC | 4 | Group of 13 oil-producing nations: Abbr. |
| 62% | OPEC | 4 | Group of 15 Nations, headquartered in Vienna: Abbr. |
| 62% | XMEN | 4 | Group of mutants created by 27-Down: Hyph. |
| 61% | OPEC | 4 | Group of oil-producing nations formed in 1960: Abbr. |
| 61% | BLOC | 4 | Group of parties or nations with a shared purpose |
| 61% | OPEC | 4 | International group of oil-producing nations: Abbr. |
| 59% | IRE | 3 | European nation west of England (Abbr.) |
| 58% | VIKINGS | 7 | First group of Europeans to colonize the New World |
| 57% | BEEGEE | 6 | Member of the 27-Down group |
| 55% | KLAN | 4 | Birth of a Nation group |
| 55% | TRIBAL | 6 | Of ''Survivor'' groups |
| 55% | MALTA | 5 | European island nation with a population of around 500,000 |
| 53% | OPEC | 4 | Oil-producing group of 14 nations: Abbr. |
| 53% | AXIS | 4 | ___ powers, group of nations that fought against the Allied powers in World War II |
| 52% | MALTA | 5 | Mediterranean island nation that's part of the European Union |
| 52% | HURON | 5 | First Nations group of the Great Lakes region |
| 52% | KLAN | 4 | "The Birth of a Nation" group |