commencement vs change of state

commencement and change of state both are nouns.

Word	Noun	Adjective	Verb	Adverb
commencement	Yes	No	No	No
change of state	Yes	No	No	No

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

commencement: the act of starting something
change of state: the act of changing something into something different in essential characteristics

commencement (noun)	change of state (noun)
the act of starting something	the act of changing something into something different in essential characteristics
an academic exercise in which diplomas are conferred
the time at which something is supposed to begin