Recently playing in a friends world, and he had a sword that had four enchantments. I'm not sure if it's legit or not because before you enter his world, it'll give you the message that says the world was previously saved in creative. Just answer with a yes or no whether or not it's possible, because throughout my time playing this, I've never gotten one.
Yes, it can receive up to four enchantments. Basically the higher your level, the higher chance you have of receiving more powerful enchantments and an increased amount of enchantments on whatever you're enchanting.
Sword: Mob damager, knockback, fire, looting.
Bow: Power, punch, flame, infinity.
Stay fluffy~