手早い答え
dinheiro はお金全般、moeda は硬貨または公式通貨です。
確実な見分け方は、英語から訳す前に、その単語の働きを見きわめることです。
それぞれの単語の働き
dinheiro
money
Use dinheiro for money in general or cash as a payment method.
moeda
coin or currency
Use moeda for a metal coin or the monetary unit used by a country.
選び方
- dinheiro: Choose dinheiro if the sentence points to money in general or cash as a payment method.
- moeda: Choose moeda if the sentence points to a metal coin or the monetary unit used by a country.
例文
Não tenho dinheiro em espécie.
I do not have cash.
O real é a moeda do Brasil.
The real is Brazil’s currency.
よくある落とし穴
Moeda can name the system as well as a physical coin, but it does not replace dinheiro in ordinary statements about having money.
文脈の中で練習する
自分の実生活から文を一つ選び、二回書いてみましょう。一度はdinheiroで、もう一度はmoedaで。どちらも成り立ちそうなら、意味の違いを言葉にしてみましょう。