maintainer
1. [ noun ] someone who upholds or maintains
Synonyms: upholder sustainer
Examples:

"firm upholders of tradition" "they are sustainers of the idea of democracy"

Related terms: supporter prolong uphold
Similar spelling:   maintain
  maintained
  maintainable
  Mantini
  Mantinea
  mandaean
  maintenance
  mountaineer
  Mantineia
  maintenon
  manhattan