Yes. Desalinization is a redundant and incorrect form, so desalination only should be used.
The word software is interchangeable with the word programing as related to computers.
program
Programs.
Sometimes they have to do desalination to a sea.
Whether or not the words 'semper' and 'sempre' are interchangeable depends upon the context in English. The word 'semper' is Latin for 'always'. The word 'sempre' is Italian for 'always'.