pirate

nouns

someone who uses another person's words or ideas as if they were his own
literary pirate, pirate, plagiariser, plagiarist, plagiarizer
is derived from
piratical
someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
buccaneer, pirate, sea robber, sea rover
is derived from
piratical
a ship that is manned by pirates
pirate, pirate ship
is derived from
piratical

verbs

copy illegally; of published material
pirate
is derived from
piracy
domain category
(criminal law) an act punishable by law; usually considered an evil act
"a long record of crimes"
crime, criminal offence, criminal offense, law-breaking, offence, offense
is a type of (narrower)
take without the owner's consent
"Someone stole my wallet on the train"; "This author stole entire paragraphs from my dissertation"
steal
take arbitrarily or by force
"The Cubans commandeered the plane and flew it to Miami"
commandeer, highjack, hijack, pirate
is derived from
piracy