As nouns the difference between pirate and bandit
is that
pirate is a criminal who plunders at sea; commonly attacking merchant vessels, though often pillaging port towns while
bandit is one who robs others.
As a verb pirate
is to appropriate by piracy, plunder at sea.
As an adjective pirate
is illegally imitated or reproduced, said of a well-known trademarked product or work subject to copyright protection and the counterfeit itself.