1. A person employed to keep watch for some anticipated event
   "The spotters were positioned along the parade route";
   - lookout, sentinel, sentry, watch, scout
    
2. [Brit] Someone who observes or takes notes about instances of a particular type of thing as a hobby
   "bird spotter"; "train spotters"
    
3. A worker employed at a dry-cleaning establishment to remove spots
   "The skilled spotter was able to remove even the toughest stains from the garment"
    
4. A worker employed to apply spots (as markers or identifiers)
   "The spotter carefully applied coloured dots to the fabric samples"
    
5. Someone who is the first to observe something
   "The amateur astronomer was the first spotter of the new comet";
   - finder, discoverer

Derived forms: spotters

Type of: beholder, employe [US], employee, observer, perceiver, percipient, security guard, watcher

Encyclopedia: Spotter