I agree with Camila, you will have to listen to context because it is pronounced the same. Also, usually you would not use casar without it being reflexive. (ella se casó con su novio ayer) whereas cazar is not relexive (Juan fue a cazar bestias en la arboleda)

In my country (Argentina) they are pronounced the same, yu can tell them apart based on the context that they are in :)

Hello ! You're right, the pronunciation is very similar. In Spain, the letter S is pronounced as in the word SUN in english. The letter Z is pronounced like the termination of the word BATH, or BOTH. But in other countries, both letters have the same pronunciation: S like SUN ( for example, in Argentina and other countries in Latin America ) You can listen the pronunciation here: http://www.studyspanish.com/pronunciation/letter_s.htm http://www.studyspanish.com/pronunciation/letter_z.htm Best wishes Sofía.