WK stands for Workstation (musical keyboards)
WK stands for Work
WK stands for Week
WK stands for Well Known
WK stands for Who Knows?
WK stands for Wiz Khalifa (rapper)
WK stands for White Knight
WK stands for Willis-Knighton (hospital)
WK stands for Wereld Kampioenschap (Dutch: World Cup)
WK stands for Weiß Kreuz (anime series)
WK stands for Wistar-Kyoto (rat breed)
WK stands for Andrew Wilkes-Krier (singer)