No, they are not the same; they are assigned to different programs and for different students. A thesis is a detailed research project assigned to students. It offers the original and well-researched work. It normally takes 6 months or 1 year to complete a project, and it takes 50 to 100 pages. On the flip side, a PhD dissertation is a comprehensive research project assigned to PhD students, and it is more detailed and longer than a thesis. It takes 2 to 4 years to finish a PhD dissertation, and it covers more than 200 pages. For any guidance, do not forget to engage with good Dissertation Writing Services, and they will help you.