Main entry: finder, discoverer, spotter
Definition: someone who is the first to observe something
Main entry: lookout, lookout man, picket, sentinel, sentry, scout, spotter, watch
Definition: a person employed to keep watch for some anticipated event
Main entry: spotter
Definition: a worker employed to apply spots (as markers or identifiers)
Main entry: spotter
Definition: a worker employed at a dry-cleaning establishment to remove spots