Used as verbs, "raise" is a transitive verb. That means it has a direct object. The subject raises the object. "To raise" means to "move something to a higher position", "to lift something up", or "to elevate something". Example: "The woman raises the flag". The woman does the raising, and the flag gets raised. "Rise" is an intransitive verb. It has no direct object. The subject acts on itself. It's similar to a portuguese reflexive verb. "To rise" means "to get up from a lying, sitting or kneeling posture". Example: "The woman rises at 6:00 in the morning.". The subject rises itself. They can also be used as nouns, but I imagine that your confusion is regarding their use as verbs. Theses words have many variations, and I suggest you look both of them up in a dictionary.