familiarisation vs familiarization

familiarisation and familiarization both are nouns.

Word	Noun	Adjective	Verb	Adverb
familiarisation	Yes	No	No	No
familiarization	Yes	No	No	No

As nouns, familiarisation and familiarization are synonyms defined as:

familiarisation and familiarization: the experience of becoming familiar with something

familiarisation (noun)	familiarization (noun)
the experience of becoming familiar with something	the experience of becoming familiar with something