sysop

Short definition from Wiktionary

Noun

1. 1
   A system operator, especially someone who administers an online communications system or bulletin board.
2. 2
   An administrator on a wiki.
3. 3
   Alternative letter-case form of sysop.

Verb

1. 1
   To work as a sysop.
2. 2
   To grant someone sysop privileges.