Conjunction

1. While on the contrary; although; whereas.

   Where Susy has trouble coloring inside the lines, Johnny has already mastered shading.

2. At or in which place or situation.

   He is looking for a house where he can have a complete office.

3. To which place or situation.

   The snowbirds winter where it is warm.

4. Wherever.

   Their job is to go where they are called.

Adverb

1. (used interrogatively, in either a direct or indirect question) At what place; to what place; what place.

   Where are you?

   Where are you going?

   Where did you come from?

2. In what situation.

   Where would we be without our parents?

Pronoun

1. The place in which.

   He lives within five miles of where he was born.

Noun

1. The place in which something happens.

   A good article will cover the who, the what, the when, the where, the why and the how.