How do you say chord in Japanese?
— 和音 (わおん, waon)

Generic synonyms for chord in Japanese
change変化 (へんか, henka); 変更 (へんこう, henkō)
play遊ぶ (あそぶ, asobu)
Specialized synonyms for chord in Japanese
key鍵 (かぎ, kagi)
Category relationships for chord in Japanese
music音楽 (おんがく, ongaku)