plagiarism vs plagiarize

plagiarism is a noun but plagiarize is not a noun.

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

plagiarism (noun)	plagiarize (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 (verb)	plagiarize (verb)
	take without referencing from someone else's writing or speech; of intellectual property