This is the 124th most frequent Korean word.
달러
Dollar.
In this sentence, the word '달러' refers to 'dollars', which is a currency unit, and is used as a noun in a financial context.
나는 100달러를 받았어요.
I received 100 dollars.
Here, '달러' represents the 'US dollar' and is used in an economic context discussing currency value.
요즘 미국 달러 가치가 떨어지고 있어요.
The value of the US dollar is decreasing these days.
In this case, '달러' refers to the US currency and is used to indicate the type of money not accepted by a store.