Definition of backer:
holy man, hierophant, aid, meal ticket, friend, protagonist, espouser, Indian giver, high priest, contributor, underwriter, a good/bad/big etc. tipper, champion, payer, adherent, expounder, white knight, advocator, paladin, source, disciple, donor, guaranty, proponent, apostle, law, help, true believer, tub-thumper, gospeler, promoter, holy person, patron, surety, advocate, guarantor, supplier, support, supporter, saint, study at sponsor, ally, sympathizer, fellow traveler, herald, bedfellow, booster, sponsor, sponsor, patron, angel, confederate, paymaster, partisan.
assistant (part of speech: noun)
- "The Glands Regulating Personality", Louis Berman, M.D..
- "Christopher and Columbus", Countess Elizabeth Von Arnim.
- "The Film Mystery", Arthur B. Reeve.