The A-Z list of the Harry Potter World - The most important terms, characters, places et. al. in James's (who? Harry James Potter ;)) world in an alphabetically ordered list. This list isn't compete. For a complete list, go here [link].

A - Avada Kedavra

B - Bellatrix 'Bella' Lestrange

E - Expecto Patronum

F - Fudge

H - Hermione, Hogwarts School of Witchcraft and Wizardry, Hagrid too! {the list says 'Harry Potter'}

I - Imperio (Imperius Curse)

J - J. K. Rowling (well, one can't leave her out!)

K - Knight Bus

O - O.W.L.s

R - Ron Weasley (although the list mentions the Weasleys in W but Ron needs special mention)

T - Transfiguration

Z - Little to choose from but maybe, Mrs. Zabini for her 'alleged' supreme beauty ;)

Read more here [link]