SPOTTER

/ˈspɒt.ə/ Scrabble 9 Words With Friends 10

Definition

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