installment vs commencement

installment and commencement both are nouns.

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

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

Other hypernyms of installment include beginning, start.

installment (noun)	commencement (noun)
the act of installing something (as equipment)	the act of starting something
a part of a broadcast serial	an academic exercise in which diplomas are conferred
a part of a published serial	the time at which something is supposed to begin
a payment of part of a debt; usually paid at regular intervals