Charms and enchantments

I'm haflway done with Harry Potter. Chrissa finished a few days ago and has been anxiously waiting for me to finish, so that we can theorize about the next book. The other day I was lying in bed, reading, and she asked me the difference between "a hex, a curse, an enchantment, and a jinx." I tried to reason it out and she basically said, "If you don't really know, don't try and guess."

I hate not knowing something, so I decided to find out...

spell - A word or formula believed to have magic power
charm - An action or formula believed to have magic power; the chanting of a magic word or verse, incantation; an item worn for its supposed magical benefit, as in warding off evil; an amulet
enchantment - a psychological state induced by an incantation; a magical spell
incantation - a formula used in ritual recitation; a verbal charm or spell
conjuration - a ritual recitation of words or sounds believed to have magical effect; calling up a spirit or devil
curse - to invoke evil or misfortune on
hex - an evil spell; a curse
jinx - a person or thing believed to bring bad luck
blessing - to invoke good or fortune on

The running theme seems to be this: you have to either speak, write, or create symbols in order to cause magic. You can either bless or charm something (good) or curse it (bad). If something protects or brings good luck, it's a charm...if it curses or brings bad luck, it's a jinx. If you create something using magic, you've conjured it (especially if it's a spirit or devil). If you are under the influence of magic, you are enchanted. The word "hex" comes from German, and is also used to describe magical symbols written on items to protect or curse them. Got it? Good.