enthronement vs enthronisation

enthronement and enthronisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
enthronement	Yes	No	No	No
enthronisation	Yes	No	No	No

As nouns, enthronement and enthronisation are synonyms defined as:

enthronement and enthronisation: the ceremony of installing a new monarch

Other synonyms of enthronement include coronation, enthronization, investiture.

enthronement (noun)	enthronisation (noun)
the ceremony of installing a new monarch	the ceremony of installing a new monarch