This is the 141st most frequent Russian word.
деньги
Money.
Here, the word 'деньги' (money) is used as a direct object to indicate possession.
У меня есть деньги.
I have money.
In this case, 'деньги' (money) refers to the amount spent, showing financial expenditure.
Я потратил все деньги на книги.
I spent all the money on books.
Here, 'денег' (a form of 'деньги' in the genitive case) indicates a lack or absence of money, essential for the context.