upholder(n = noun.person) maintainer, sustainer - someone who upholds or maintains; "firm upholders of tradition"; "they are sustainers of the idea of democracy"
is a kind of admirer, booster, champion, friend, protagonist, supporter
Derived forms verb uphold3, verb uphold1
1. A broker or auctioneer; a tradesman. [1913 Webster]
2. An undertaker, or provider for funerals. [1913 Webster]
"The upholder, rueful harbinger of death." [1913 Webster]
3. An upholsterer. [1913 Webster]
4. One who, or that which, upholds; a supporter; a defender; a sustainer. [1913 Webster]
N auxiliary, recruit, assistant, adjuvant, adjutant, ayudante, coaid, adjunct, help, helper, help mate, helping hand, midwife, colleague, partner, mate, confrere, cooperator, coadjutor, coadjutrix, collaborator, ally, friend, confidant, fidus Achates, pal, buddy, alter ego, confederate, accomplice, complice, accessory, accessory after the fact, particeps criminis, socius criminis, aide-de-camp, secretary, clerk, associate, marshal, right-hand, right-hand man, Friday, girl Friday, man Friday, gopher, gofer, candle- holder, bottle-holder, handmaid, servant, puppet, cat's-paw, jackal, tool, dupe, stooge, ame damnee, satellite, adherent, votary, sectarian, secretary, seconder, backer, upholder, abettor, advocate, partisan, champion, patron, friend at court, mediator, angel (theater, entertainment), friend in need, Jack at a pinch, deus ex machina, guardian angel, tutelary genius.