Npk is correct, but it's a pedantic distinction. Most people, apparently including the Wikipedia editors, just use the two words interchangably.
Edit: yikes. Somebody went on a downmodding spree on this thread.
Edit: yikes. Somebody went on a downmodding spree on this thread.
"In academia, a thesis or dissertation is a document that presents the author's research and findings and is submitted in support of candidature for a degree or professional qualification."
[from http://en.wikipedia.org/wiki/Thesis]