How do you say conversation in Japanese?
— 会話; かいわ (kaiwa); 談話 (tanwa); 対話 (taiwa); 対話 (taiwa); 話し (hanashi); カンバセーション (kanbāsēshon)

Generic synonyms for conversation in Japanese
language言語 (げんご, gengo)
Specialized synonyms for conversation in Japanese
talk話す (はなす, hanasu)