IELTS Anvil

observer

CEFR: B2

A person who watches, monitors, or notes something systematically for scientific, journalistic, or meteorological purposes.

Synonyms

onlooker
spectator
watcher

Common Collocations

impartial observer
keen observer
scientific observer

Example Sentence

Volunteer ornithological observers recorded over fifty thousand migrating raptors passing over the mountain ridge.

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