Zamasu, the "present" Zamas from the main timeline's altered flow of time. He was supposedly killed by Beerus, but the present Zamasu survived as Goku Black because of the Time Ring.
Goku Black, the "present" Zamasu from the main timeline's original flow of time who used the Super Dragon Balls to switch bodies with Goku, but was saved from being erased from existence due to the Time Ring.
Future Zamasu, the Zamas from Future Trunks' timeline, who used the Super Dragon Balls to become immortal.
Fused Zamasu, the fusion between Goku Black and Future Zamasu, created by a Potara fusion.
Fused Zamasu, the fusion of Goku Black and Present Zamasu in Dragon Ball Fusions, created by a Potara fusion.
Zamases, the collective term for the allied incarnations of Zamasu.