spot ‧ ter /ˈspɒtə $ ˈspɑːtər/ BrE AmE noun [countable]
1 . bird/train etc spotter British English someone who spends time watching birds, trains etc for pleasure and writes down the things that they see
2 . someone whose job is to look for or notice a particular type of thing:
Football clubs send spotters to look for young talent.
weather spotter American English