Greek Mythology question!! please help!?

Ok well Dionysus is the god of wine(or grape harvest. whatever:P) and Demeter is the goddess of the harvest and fertility of the earth. They are different from the other olympians because they are known as mankind's friends. They are similar to one another for the obvious reason that they are both part of the harvest. They are different because well i guess Dionysus is grape harvest and Demeter is more of the harvest in general! :)