installing vs installment

installing and installment both are nouns.

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

As nouns, installing and installment are synonyms defined as:

installing and installment: the act of installing something (as equipment)

Other synonyms of installing include installation, instalment.

installing (noun)	installment (noun)
the act of installing something (as equipment)	the act of installing something (as equipment)
	a part of a broadcast serial
	a part of a published serial
	a payment of part of a debt; usually paid at regular intervals