pleader (n.)

• abettor
• actuator
• advocate
• agent
• alternate
• animator
• apologist
• attorney
• backup
• barrister
• champion
• coax
• coaxer
• counsel
• counselor
• counselor-at-law
• defender
• deputy
• dummy
• energizer
• exponent
• figurehead
• gadfly
• galvanizer
• impeller
• inducer
• inspirer
• intercessor
• justifier
• lawyer
• lieutenant
• locum
• mouthpiece
• mover
• persuader
• proctor
• procurator
• prompter
• proponent
• proxy
• representative
• secondary
• solicitor
• spark
• sparker
• stand-in
• substitute
• surrogate
• tempter
• understudy
• vicar
• vice
• vicegerent
• vindicator
• wheedler