Definitions of bounty hunter:
Oxford: A person who pursues a criminal or fugitive for whom a reward is offered.
Cambridge: Someone who searches for criminals or hunts animals in exchange for a reward.
Collins: A bounty hunter is someone who tries to find or kill someone in order to get the reward that has been offered.
Merriam-Webster: Someone who catches criminals who have not been caught by the police in exchange for a reward.
Dictionary.com: A person who hunts outlaws or wild animals for the bounty offered for capturing or killing them.
None of the dictionaries say that a bounty hunter has to be a criminal. But, in Star Wars, all bounty hunters I see are criminals. They don't care about laws. They kill just about anyone in their way. They loot ships as their own declared reward.
Are there "good" bounty hunters in the Star Wars universe: ones who work within the limits of laws?