installing vs instalment

installing and instalment both are nouns.

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

As nouns, installing and instalment are synonyms defined as:

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

Other synonyms of installing include installation, installment.

installing (noun)	instalment (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