different between birdwatcher vs birdwatched

English

bird +? watcher

birdwatcher (plural birdwatchers)

(birdwatching) A person who observes or identifies wild birds in their natural environment.
- 1959, Muriel Spark, Memento Mori, London: Macmillan, Chapter Five,
  Alec Warner was gazing like a bird-watcher at Charmian, who plucked at the rug round her knees, waiting to tell her own story.
(slang) A person who enjoys watching rocket launches.
- 1957, Skyline (volumes 15-18, page 7)
  In fact, on this night, the birdwatching is over for everyone, for the firing is cancelled. Nobody notifies birdwatchers officially, of course, so the exodus is scattered and gradual.
- 1961, Canadian Motorist (page 15)
  […] particularly those carrying astronauts, are the area's major drawing power, and each "advertised" shoot brings thousands of space age "birdwatchers".

birdwatched

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