x? that's just mean...
x-ray
Yule
Emma Watson
Norbert
Time Turner
ridiculous
spell book
Kingsley
Yule(Thats about the only one I can think of Y)
Ernie
Expelliarmus
sectumsempra
Accio
orange
engrogio
occlumency
Yeti
incendio
Order
everyone loves RON