summarization vs summarisation

summarization and summarisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
summarization	Yes	No	No	No
summarisation	Yes	No	No	No

As nouns, summarization and summarisation are synonyms defined as:

summarization and summarisation: the act of preparing a summary (or an instance thereof); stating briefly and succinctly

summarization (noun)	summarisation (noun)
the act of preparing a summary (or an instance thereof); stating briefly and succinctly	the act of preparing a summary (or an instance thereof); stating briefly and succinctly