commencement vs point in time

commencement and point in time both are nouns.

Word	Noun	Adjective	Verb	Adverb
commencement	Yes	No	No	No
point in time	Yes	No	No	No

As nouns, point in time is a hypernym of commencement; that is, point in time is a word with a broader meaning than commencement:

Other hypernyms of commencement include point.

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