He who must not be named
Voldermort / Tom Riddle
The unlocking spell / To unlock locked items like doors and chests.
Alohamora
Potion to transfer oneself to another
Polyjuice Potion
Half-man Half horse. Lives in the Forbidden Forest.
Centaurs
What is the platform number to board the Hogwarts Express?
Platform 9 3/4
Draco Malfoy's goons
Crabbe and Goyle
Summoning spell / To bring something to oneself
Accio
Elder Wand, Invisibility cloak and resurrection stone make what?
The deathly hallows
They are the guards of Askaban. Cloaked demons that can suck the soul right out of you, their "kiss" is deadly.
Dementors
The government of the Magical community of Britain
Ministry of Magic
The Defense against the dark arts teacher in Harry's second year (2nd movie / book)
Gilderoy Lockhart
The disarming spell
Expelliarmus
Name of the ball in quidditch
Quaffle
magical creatures with the hind quarters of a horse, but the wings, head, and front appendages of an eagle
Hippogriff
A high street located in London that is accessible to the wizarding world. This is where harry went to get his wizard gear to go to Hogwarts.
Diagon Alley
Killed Sirius Black
Bellatrix Lestrange
The Memory Charm. To make a person lose their memories
Obliviate
a glittering powder used by wizards to travel and communicate using fireplaces
Floo Powder
A black skeletal breed that is only visible to those that have witnessed death. They are considered unlucky by many wizards.
Thestrals
The Weasley's home
The Burrows
The snake that was one of the Hocruxes for He who must not be named
Nagini
Arania Exumai
usually a mundane object enchanted to bring anyone that touches it to a predetermined location
Portkey
There bottom halves are like jelly fish, their top halves barely resemble a human with jelly fish hair, they live under water, and Fleur never got past them!
grindylows
The magical school from the north and is home to Victor Krum. One of the three schools invited to the Triwizard Tournament.
Durmstrang Institute for Magical Learning