1. Tested and proved useful or correct
   - tested, tried

See also: proved, proven

• party girl
• party line
• party liner
• party man
• Party of Democratic Kampuchea
• Party of God
• party politics
• party pooper
• kok-sagyz
• Kokka
• Kokka Shinto
• kokoi venom
• Kol Nidre
• kola
• kola nut
• kola nut tree
• Kola Peninsula
• Kolam
• Kolami
• kolinsky
• Kolkata
• kolkhoz
• kolkhoznik
• Kolkwitzia
• Kolkwitzia amabilis