Play NYT Connections Puzzle #581 Sat, Dec 14

Find groups of four related words Need hints?

Solve NYT Connections puzzle #581 - Group 16 words into 4 categories: FLUKE, MULLET, SOLE, TANG, GOING, ONCE, SOLD, TWICE, POUND, REAL, SOL, YUAN, BUTTER, DIVA, SOLO, WORLD.