plagiarism vs plagiaristic

plagiarism is a noun but plagiaristic is not a noun.

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

plagiarism (noun)	plagiaristic (noun)
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

plagiarism (adjective)	plagiaristic (adjective)
	copied and passed off as your own