coadjutor (n.)

• acolyte
• adjunct
• adjutant
• agent
• aid
• aide
• aide-de-camp
• aider
• ally
• antipope
• archbishop
• archdeacon
• archpriest
• assistant
• associate
• attendant
• auxiliary
• bedfellow
• bishop
• brother
• canon
• cardinal
• chaplain
• cohort
• colleague
• companion
• compatriot
• compeer
• comrade
• confederate
• confrere
• consort
• crony
• curate
• dean
• deputy
• diocesan
• exarch
• fellow
• help
• helper
• helpmate
• helpmeet
• hierarch
• lieutenant
• metropolitan
• papa
• paraprofessional
• patriarch
• penitentiary
• pontiff
• pope
• prebendary
• prelate
• primate
• rector
• second
• servant
• suffragan
• vicar