Wifebeater vs. Tanktop: What's the Difference?

Wifebeater and Tanktop Definitions
Wifebeater
A man who beats his wife.
Tanktop
Alternative spelling of tank top
Wifebeater
Offensive Slang A white, sleeveless, usually tight-fitting undershirt.
Wifebeater
One who (usually as a repeated practice) beats his wife, or a husband prone to violence.
Wifebeater
A kind of sleeveless shirt, often but not exclusively worn as an undershirt.
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Wifebeater
, a brand of lager beer.