Play NYT Connections Puzzle #397 Sat, Jun 22

Find groups of four related words Need hints?

Solve NYT Connections puzzle #397 - Group 16 words into 4 categories: CHAIN, TRAIN, SERIES, STRING, DRIVER, IRON, WEDGE, WOOD, BIRDS, FOG, OMEN, RING, BRAT, DOG, FRANK, LINK.