juror — one of a group of persons sworn to deliver a verdict in a case submitted to them; member of a jury.
purer — free from anything of a different, inferior, or contaminating kind; free from extraneous matter: pure gold; pure water.
surer — free from doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
Three-syllable rhymes
der fuhrer — Adolf [ad-olf,, ey-dolf;; German ah-dawlf] /ˈæd ɒlf,, ˈeɪ dɒlf;; German ˈɑ dɔlf/ (Show IPA), (Adolf Schicklgruber"der Führer") 1889–1945, Nazi dictator of Germany, born in Austria: Chancellor 1933–45; dictator 1934–45.
insurer — a person or company that contracts to indemnify another in the event of loss or damage; underwriter.
procurer — a person who procures, especially a pander or pimp.