housing start vs commencement

housing start and commencement both are nouns.

Word	Noun	Adjective	Verb	Adverb
housing start	Yes	No	No	No
commencement	Yes	No	No	No

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

Other hypernyms of housing start include beginning, start.

housing start (noun)	commencement (noun)
the act of starting to construct a house	the act of starting something
	an academic exercise in which diplomas are conferred
	the time at which something is supposed to begin