From the memory of the last movie of Harry Potter I saw, I've seen many wizards cast spell without saying the spell at all. During the final battle in Hogwazt, many wizards usually just swing his/her wand and their enemy was knocked out. I am 100% sure about this!

The most remarkable spell was the spell that emit a green/red beam in the final battle of Harry Potter against Voldemort and they pushed their beam towards each other.

So, the question is, are they cheating? Because they must spell the words for a spell unless there are wordless-spell.

From my memory of the last Harry Potter movie I saw, I've seen many wizards cast spells without saying the spell at all. During the final battle in Hogwarts, many wizards just swung their wands and their enemies were knocked out. I am 100% sure about this!

The most remarkable spells were the ones that emit a green or red beam in the final battle of Harry Potter against Voldemort when they pushed their beams towards each other.

So, the question is, are they cheating? Because, unless there are wordless spells, they must say the words for a spell.