desalinisation vs desalination

desalinisation and desalination both are nouns.

Word	Noun	Adjective	Verb	Adverb
desalinisation	Yes	No	No	No
desalination	Yes	No	No	No

As nouns, desalinisation and desalination are synonyms defined as:

desalinisation and desalination: the removal of salt (especially from sea water)

Other synonyms of desalinisation include desalinization.

desalinisation (noun)	desalination (noun)
the removal of salt (especially from sea water)	the removal of salt (especially from sea water)