literary pirate vs plagiariser

literary pirate and plagiariser both are nouns.

Word	Noun	Adjective	Verb	Adverb
literary pirate	Yes	No	No	No
plagiariser	Yes	No	No	No

As nouns, literary pirate and plagiariser are synonyms defined as:

literary pirate and plagiariser: someone who uses another person's words or ideas as if they were his own

Other synonyms of literary pirate include pirate, plagiarist, plagiarizer.

literary pirate (noun)	plagiariser (noun)
someone who uses another person's words or ideas as if they were his own	someone who uses another person's words or ideas as if they were his own