spotter

US /ˈspɑː.t̬ɚ/
UK /ˈspɑː.t̬ɚ/
"spotter" picture
1.

a person who observes and identifies something, especially aircraft, birds, or trains, as a hobby

:
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The plane spotter spent hours at the airport, noting down every aircraft.
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Bird spotters often travel to remote areas to see rare species.
:
observerwatcherdetectorfinder
2.

a person who assists a weightlifter by standing by to take the weight if necessary

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He asked his friend to be his spotter during his heavy bench press set.
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Always use a spotter when lifting weights, especially if you are pushing your limits.
:
assistanthelpersupport