What is the difference between project and thesis? How project and thesis differs in terms of creativity ?

which one is original ?  project or thesis ?
any formal definition for project and thesis ?
It differs by school. Technically, a thesis is a claim that can be proven or disproven, but, in practice, the term "thesis" is often used for a project (for undergraduate or Master's degrees). On the other hand, a PhD thesis is not just a project; it should advance the state of knowledge in a field in a way that can only be done by someone knowledgeable in the field.

My department is considering renaming our Master's thesis requirement to Master's project, to acknowledge that it need not be a research contribution.

Of course, even a project can entail publishable work or advance the state of the art, but it need not.