In the following set of words, which is different than the others?

Question

Quizplus · Accepted Answer

An 'examination' is a specific test of a person's knowledge. It does not necessarily involve writing in all cases, which is why it is not similar to the rest of the words in the group.
A 'thesis' is a long essay that is put forward to be proven through its writing. It is similar to the other words in the set (excluding "exam") since they are all pieces of writing that involve some form of research in order to be completed.
A 'manuscript' is a book or written document that has yet to be published.
An 'essay' is a short piece of writing on a particular subject.
A 'dissertation' is a long essay on a particular subject, especially written when obtaining a university degree.

In the Following Set of Words, Which Is Different Than