The phonetic transcription of "onlooker" is /ˈɒnˌlʊkər/ in British English and /ˈɑːnˌlʊkər/ in American English. Click the 🔊 button to hear both pronunciations.
Synonyms for "onlooker": spectator, observer, witness, bystander.
Example usage of "onlooker": "The onlooker saw the car crash on the street corner.". More examples on the page.