Play NYT Connections Puzzle #428 Fri, Jul 19

Find groups of four related words Need hints?

Solve NYT Connections puzzle #428 - Group 16 words into 4 categories: FLAME, LOVER, STEADY, SWEETHEART, BURN, DIG, JAB, SLIGHT, DIESEL, PLUS, PREMIUM, REGULAR, COFFEE, PERIODIC, POOL, WATER.