1) Admirer 2) Booster 3) Champion 4) Friend 5) Legal stds 6) One who takes care of things 7) Protagonist 8) Supporter 9) Sustainer 10) Upholder 1) Sustainer 2) Upholder 
• (n.) One who maintains.
A volunteer who maintains a section of trail as part of a trail-maintenance program of a trail organization.
A device utilised to hold or keep teeth in a given position. ... (05 Mar 2000) ... 
(mān-tān´әr) something that keeps or maintains existence or continuity in another thing. space maintainer an orthodontic appliance, fixed or removable, that maintains the space left by a prematurely lost tooth or space that will be filled by a tooth not yet erupte...
Main·tain'er noun One who maintains. 
Type: Term Pronunciation: mān-tān′ĕr Definitions: 1. A device used to hold or keep teeth in a given position.