How do you say dynasty in Japanese?
— 王朝

Generic synonyms for dynasty in Japanese
family親戚 (しんせき, shinseki), 親類 (しんるい, shinrui), 親族 (しんぞく, shinzoku)
Specialized synonyms for dynasty in Japanese
song歌 (うた, uta); 歌曲 (かきょく, kakyoku)