Play NYT Connections Puzzle #312 Thu, Apr 11

Find groups of four related words Need hints?

Solve NYT Connections puzzle #312 - Group 16 words into 4 categories: BOWL, BUZZ, CREW, PIXIE, COMPASS, RULER, SCALE, WATCH, CHANNEL, LINE, MAIN, PIPE, CLOWN, COLONEL, KING, MERMAID.