instalment vs installation

instalment and installation both are nouns.

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

As nouns, instalment and installation are synonyms defined as:

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

Other synonyms of instalment include installing, installment.

instalment (noun)	installation (noun)
the act of installing something (as equipment)	the act of installing something (as equipment)
a part of a broadcast serial	a building or place that provides a particular service or is used for a particular industry
a part of a published serial	a formal entry into an organization or position or office