Spectator

google

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late 16th century: from French spectateur or Latin spectator, from spectare ‘gaze at, observe’ (see spectacle).

wiktionary

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Borrowed from Latin spectātor, from frequentative verb spectō(“watch”), from speciō(“look at”). Equivalent to spectate +‎ -or.

etymonline

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spectator (n.)

1580s, from Latin spectator "viewer, watcher," from past participle stem of spectare "to view, watch" (see spectacle). Spectator sport is attested from 1943. Related: Spectatorial. Fem. form spectatress (1630s) is less classically correct than spectatrix (1610s).