Commencement
Part of speech: noun
Definition: The first existence of anything; act or fact of commencing; rise; origin; beginning; start. The day when degrees are conferred by colleges and universities upon students and others. A graduation ceremony, from a school, college or university.
Graduation
Part of speech: noun
Definition: The action or process of graduating and receiving a diploma for completing a course of study (such as from an educational institution).A commencement ceremony.A marking (i.e. on a container) indicating a measurement.