Roget's Thesaurus: Entry 444 (Spectator)

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#444. Spectator. -- N. spectator, beholder, observer, looker-on, onlooker, witness, eyewitness, bystander, passer by; sightseer; rubberneck , rubbernecker * [U. S.].

spy; sentinel &c. (warning) 668.

V. witness, behold &c. (see) 441; look on &c. (be present) 186; gawk, rubber *, rubberneck *[U.S.].