instalment vs installing

instalment and installing both are nouns.

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

As nouns, instalment and installing are synonyms defined as:

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

Other synonyms of instalment include installation, installment.

instalment (noun)	installing (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