monitor (n.)
- admonisher
- adviser
- announcer
- annunciator
- audit
- auditor
- authority
- autodidact
- autopsy
- boatswain
- boss
- buttinsky
- cameraman
- canvass
- channel
- check
- chief
- communicant
- communicator
- comptroller
- confidant
- consultant
- controller
- counsel
- counselor
- custodian
- display
- educatee
- expert
- floorwalker
- foreman
- gaffer
- ganger
- gossipmonger
- grapevine
- guard
- guardian
- guide
- ham
- head
- headman
- informant
- informer
- inquirer
- inspector
- instructor
- intern
- interviewee
- kibitzer
- learner
- lookout
- meddler
- mentor
- mixer
- mouthpiece
- nestor
- newsmonger
- overhaul
- overlook
- overseer
- paraprofessional
- postmortem
- prefect
- press
- proctor
- publisher
- pupil
- radio
- record
- reporter
- review
- scan
- scholar
- sentinel
- sentry
- signaler
- signalman
- sirdar
- size
- source
- spokesman
- student
- study
- super
- superintendent
- supervisor
- survey
- surveyor
- taskmaster
- teacher
- television
- teller
- tipster
- tout
- trace
- track
- trainee
- vet
- visitor
- warner
- watch
- watchdog
- witness
