Play NYT Connections Puzzle #745 Thu, May 15

Find groups of four related words Need hints?

Solve NYT Connections puzzle #745 - Group 16 words into 4 categories: BASIS, FOUNDATION, GROUNDS, REASON, CRUST, ICE, POWDER, SLUSH, BESS, BUTTERFLY, FLUTE, SEVILLE, DEAL, ESTATE, MADRID, WORLD.