Spectator
Nouns
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spectator, beholder, observer, looker-on, onlooker, witness, eyewitness, bystander, passer by
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sightseer
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rubberneck, rubbernecker [U.S.]. spy
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sentinel etc. (warning) Warning.
Verbs
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witness, behold etc. (see) Vision
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look on etc. (be present) Presence
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gawk, rubber [Slang], rubberneck [U.S.].