thesis vs dissertation

thesis and dissertation both are nouns.

Word	Noun	Adjective	Verb	Adverb
thesis	Yes	No	No	No
dissertation	Yes	No	No	No

As nouns, thesis and dissertation are synonyms defined as:

thesis and dissertation: a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree

thesis (noun)	dissertation (noun)
an unproved statement put forward as a premise in an argument	a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree
a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree