O- occlumency
P- Potter
Q- Quirrell
R- Remembral
S- Slytherin
T- transfiguration
U- Umbridge
V- vampire
W- Wingardium Leviosa
X- Xenophilus
Y- Yule Ball
Z- Zambini
A- Anapneo
B- bludger
C- Colin Creevy
D- Dobby
E- Evanesco
F- fizzing whizbees
G- George Weasley
H- Hagrid