thesis: "A dissertation to maintain and prove a thesis (in sense 3); esp. one written or delivered by a candidate for a University degree." OED

dissertation: "A spoken or written discourse upon or treatment of a subject, in which it is discussed at length; a treatise, sermon, or the like" OED

If you're planning to complete a master's thesis or dissertation here at GVSU, consider browsing the Graduate School resource page, or specifically this resource: Thesis and Dissertation Information

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