I'm not writing your essay for you, but I can help you.
Think of it this way, a hypothesis is like a guess. "If I try this silly thing, then chances are this will happen." If what you thought would happen doesn't actually happen, then you scrap the hypothesis and try a new one.
A theory, on the other hand, is a hypothesis that has gone through many tests, and has been proven to be correct for all the times it has been tested. For instance, "When I throw the ball up into the air, it will come down," is a viable theory because it's been tried and proven to be true (on Earth, or on any other large body of mass that has sufficient gravity)
Think of it this way, a hypothesis is like a guess. "If I try this silly thing, then chances are this will happen." If what you thought would happen doesn't actually happen, then you scrap the hypothesis and try a new one.
A theory, on the other hand, is a hypothesis that has gone through many tests, and has been proven to be correct for all the times it has been tested. For instance, "When I throw the ball up into the air, it will come down," is a viable theory because it's been tried and proven to be true (on Earth, or on any other large body of mass that has sufficient gravity)