opening move vs commencement

opening move and commencement both are nouns.

Word	Noun	Adjective	Verb	Adverb
opening move	Yes	No	No	No
commencement	Yes	No	No	No

As nouns, commencement is a hypernym of opening move; that is, commencement is a word with a broader meaning than opening move:

Other hypernyms of opening move include beginning, start.

opening move (noun)	commencement (noun)
the first of a series of actions	the act of starting something
	an academic exercise in which diplomas are conferred
	the time at which something is supposed to begin