OK LEARN BASIC SLANG DONT ASK US WHY WE USE THEM! ASK THE WEIRDO WHO BEGAN SLANG AND WHO MADE IT SUCH A TREND
Tankers come from the word tank their defenses are so heavy they have to take alot to explode (or 'die') and have alot of power (physical in this case)
Nukers come from the word nuke, which represent a
single missile delivering a mass of destruction (a nuke (atomic bomb) being dropped and the core causing the nuke to explode causing major destruction (magic damage) around it)