How to write 志愿者志愿者

honest; prudent; variant of 愿

(after a verb or adjective) one who (is) ...; (after a noun) person involved in ...; -er; -ist; (used after a number or 后 or 前 to refer to sth mentioned previously); (used after a term, to mark a pause before defining the term); (old) (used at the end of a command); (old) this