What is the meaning of Spotter?

A person who observes something.

A member of a sniper team who in addition to this function is responsible for providing additional information about targets from a different point of view.

One who supervises a person performing an activity, in order to help them should they be unable to complete it.

A person who gives directions for a crane or vehicle (that is challenging to navigate) from a different point of view to the moved load.

Dolphins of the genus Stenella, and specifically Stenella attenuata distinguished from the streaker (Stenella coeruleoalba) and the spinner (Stenella longirostris).

A team member responsible for communication with the driver to keep them up-to-date about on-track events, such as other nearby cars.

A person employed to assist a sports presenter by identifying the players or events during a game.

present of spotte

mocker, scoffer, derider; a person who mocks or derides someone or something

blasphemer; a person who speaks mockingly or irreverently about God or religion

indefinite plural of spott (“mockery, derision, scorn”)

indefinite plural of spot (“spotlight; short advertisement”)

indefinite plural of spott (“spotlight; short advertisement”)

present of spotte (“to mock, deride”)

present of spotte (“to spot, notice; assist someone lifting weights”)

spotter (clarification of this definition is needed)

Source: wiktionary.org