summarisation vs summarization

summarisation and summarization both are nouns.

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

As nouns, summarisation and summarization are synonyms defined as:

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

summarisation (noun)	summarization (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