plagiarism vs plagiarisation

plagiarism and plagiarisation both are nouns.

Word	Noun	Adjective	Verb	Adverb
plagiarism	Yes	No	No	No
plagiarisation	Yes	No	No	No

As nouns, plagiarism and plagiarisation are synonyms defined as:

plagiarism and plagiarisation: the act of plagiarizing; taking someone's words or ideas as if they were your own

Other synonyms of plagiarism include piracy, plagiarization.

plagiarism (noun)	plagiarisation (noun)
the act of plagiarizing; taking someone's words or ideas as if they were your own	the act of plagiarizing; taking someone's words or ideas as if they were your own
a piece of writing that has been copied from someone else and is presented as being your own work