commencement vs commence

commencement is a noun but commence is not a noun.

Word	Noun	Adjective	Verb	Adverb
commencement	Yes	No	No	No
commence	No	No	Yes	No

commencement (noun)	commence (noun)
the act of starting something
an academic exercise in which diplomas are conferred
the time at which something is supposed to begin

commencement (verb)	commence (verb)
	take the first step or steps in carrying out an action
	set in motion, cause to start
	get off the ground