Connections Hint Today Tue, Aug 5 #821

Need help with Connections puzzle #821 on Tue, Aug 5? Get your daily connections hint today! Find the hidden links between these 16 words: METRO, SUBWAY, TUBE, UNDERGROUND, CUBE, GRATE, MINCE, SLICE, CARROT, COAL, PIPE, SCARF, DRESS, HEALTH, SECRET, ZIP