beginning vs commencement

beginning and commencement both are nouns.

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

As nouns, beginning and commencement are synonyms defined as:

Other synonyms of beginning include start.

As nouns, beginning and commencement are synonyms defined as:

beginning and commencement: the time at which something is supposed to begin

Other synonyms of beginning include first, get-go, kickoff, offset, outset, showtime, start, starting time.

beginning (noun)	commencement (noun)
the act of starting something	the act of starting something
the first part or section of something	an academic exercise in which diplomas are conferred
the event consisting of the start of something	the time at which something is supposed to begin
the place where something begins, where it springs into being
the time at which something is supposed to begin

beginning (adjective)	commencement (adjective)
serving to begin