硬貨|こうかkouka[1]atamadaka (head-high)

1. nouncoin
   これらの硬貨こうかはほとんど価値かちがない。↗

   These coins are of little value.
2. nounhard currency

• SynonymコインCasualLoanword for coins, as in 「コインロッカー」, and also for game tokens; very common in daily speech, whereas 「硬貨」 is the more standard term.
• Synonym鋳貨ちゅうかWrittenA written term for minted currency; used mostly in economic history contexts.
• Antonym紙幣しへいNeutralPaper money, the counterpart of metal 「硬貨」; in everyday speech people say 「お札」.

Use 「硬貨」 for metal coins, as in 「100円硬貨」; in daily talk 「コイン」 or 「小銭」 is common. For paper money say 「紙幣」, or 「お札」 in everyday speech. 「鋳貨」 is a written term for minted coinage.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 金属製きんぞくせいの貨幣かへい。