者 - someone, person

pioneer; settler; colonist

manager; proprietor

registrant; subscriber; enrollee

applicant

manager; administrator; landlord; warden; superintendent; supervisor; custodian

victim (esp. someone killed); casualty

disabled person; person with a (physical or mental) disability

clergyman; churchman; clergy

developer

instrumentalist; player

patient

experienced person; person who has had a particular experience