1) Eyer 2) Lookout 3) Picket 4) Scout 5) Sentinel 6) Sentry 7) Spy 1) WWII volunteer 2) Automatic bowling machine 3) Cheerleading catcher 4) Employee 5) Gymnastics coach, at times 6) Gymnastics coach, often 7) Gymnastics figure 8) Helper during gym practice 9) Weight room figure 10) Weight training partner 11) Weight-training partner 
A spotter is someone trained to look for something. The term has the following special meanings. ...[auto racing] A spotter in auto racing is a trained team member whose job is to relay information to their driver, keeping them alert of what is occurring on the track. They are typically positioned high above the track, atop one of the grandstands, or other support buildings, with a bird`s eye view of the circuit. Spotters keep in constant...
• (n.) One who spots.
A team mate who counts down a shoe for the Big Player.
Person who watches a partner closely to see if any help is needed during a specific exercise.
Those who do 'spotting', ie. stand by the side (end) of the trampoline guarding against falling off
Spot'ter noun One who spots. 
Spotter is slang for a detective.
[n] - a worker employed at a dry-cleaning establishment to remove spots 2. [n] - a worker employed to apply spots (as markers or identifiers)
A person who is there at the ready to break the fall of a climber on a boulder problem. Their job is to direct them towards the safety of the bouldering mat and make sure that should they fall awkwardly or suddenly, they areprotected from hitting the ground or nearby rocks.
Person who watches a person closely to see if any help is needed during a specific exercise.
Any person who practises aircraft recognition. Industrial raid spotters were employed by vital factories and organisations during the Second World War.
Person who watches a person closely to see if any help is needed during a specific exercise.
Member of the race team informing his or her driver on position and timing and advising on Joker Lap strategy.