| clubby(adjective, slang, friendly, affable) |
| colloquy(noun, communication, contact, interaction, human) |
| comment(noun, communication, contact, interaction, human) |
| communication(noun, contact, interaction, human, dealing) |
| communion(noun, communication, contact, interaction, human) |
| companionability(noun, communication, contact, interaction, human) |
| conciliatory(adjective, friendly, affable, nice, welcoming) |
| confabulation(noun, communication, contact, interaction, human) |
| conference(noun, communication, contact, interaction, human) |
| congenial(adjective, friendly, affable, nice, welcoming) |
| congeniality(noun, communication, contact, interaction, human) |
| consultation(noun, communication, contact, interaction, human) |
| conversation(noun, communication, contact, interaction, human) |
| converse(noun, communication, contact, interaction, human) |
| convivial(adjective, friendly, affable, nice, welcoming) |
| conviviality(noun, communication, contact, interaction, human) |
| cordial(adjective, friendly, affable, nice, welcoming) |
| cordiality(noun, communication, contact, interaction, human) |
| cracking(adjective, short, quick, brief, temporary) |
| debate(noun, communication, contact, interaction, human) |