• 銅どう — copper
• 銅貨どうか — copper coin
• 銅像どうぞう — bronze statue
• 銅線どうせん — copper wire
• 赤銅しゃくどう — reddish copper alloy
• 黄銅おうどう — brass (copper-zinc alloy)
• 青銅せいどう — bronze (copper-tin alloy)
• 白銅はくどう — cupronickel (copper-nickel alloy)

銅 is a phono-semantic compound: the radical 金 (metal) shows its meaning, while 同 provides the sound. The kun-yomi あかがね (“red metal”) is an older term describing copper’s color.