Quote Originally Posted by Paul G. View Post
In this phares "воров заинтересуют только деньги" the subject is "деньги" (nominative, as a subject must be) and an object is "воров" (plural genitive).
Sorry, a minor but important correction.

"Воров" here is not in genitive, but in accusative. Since "вор" is animate, its accusative is the same as genitive.
But it's important to understand that it is accusative, since the direct object normally takes accusative, and this phrase is not an exception.

If you replace it with a singular feminine noun, you will see the difference:

Сестру заинтересуют только деньги. Сестру - accusative (not genitive, genitive is сестры).


And here is an example to illustrate what Paul said:
Let's compare two sentences. Сын зовёт отца. and Сына зовёт отец.

Сын (nom) зовёт отца (acc). - Son calls (his) father. Here, you translate it word by word.
Сына (acc) зовёт отец (nom). - How would you translate this one? Right! Father calls (his) son.

In Russian, Сын зовёт отца = Отца зовёт сын. Отец зовёт сына = Сына зовёт отец.