Nuker...is a Wizard... I should say
Nuker means "Damage Dealers" in this game and most of the other games
Nukers are Pure Int (sometimes Hybrid where they put some on str's also) people
usually 'Wizard' for European characters and for chinese...well we call them Pure int S/S or Spear (aka Nuker I guess >.<)
Both very strong...wizard casts slower than chinese nukers but more powerful than chinese nukers. However, I want to warn you that Wizard dies very easily and one pot/15 sec when chinese are one pot/1 sec
Also, Wizards don't have snow shield or an actual shield to tank with, and don't have any disabling skills aside from Fear (stops an enemy from targeting you) and Knockback. Chinese nukers are much better at 1 vs 1.