Cliques are groups of friends, but not all groups of friends are cliques. The thing that makes a group a clique (say: KLIK) is that they leave some kids out on purpose. They form groups that they won't let other kids belong to. Sometimes kids in the clique are mean to kids they think are on the outside. Usually one or two popular kids control who gets to be in the clique and who gets left out.
B) a good dictionary will give the pronunciation of a word along with a definition. A very good dictionary will also tell you what language the word originates from. Hope this helps!