maintainer

About 0.12 uses per million words.

Meaning

1. noun Someone who keeps or upholds something; a steward.

   He become the maintainer of the software project.

2. noun A person who does maintenance work.
3. noun A device used to keep teeth in a given position.

Similar words

supervisor comptroller controller breadwinner sustenance mainstay caretaker keeper stablekeeper sustainer

Often followed by

of and is to line in lines or can