Judaisms clergy is unique

they are needed for every ritual

most rituals can be performed without clergy

rabbi's are needed for everything

there are many kinds of clergy that perform many different tasks

polisit can also mean a body of citizens. in modern historiography, polis is normally used to indicate the ancient greek city-states, like classical athens and its contemporaries, and thus is often translated as "city-state". the body of citizens came to be the most important meaning of the term polis in ancient greece.