This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A person who is present at an event without participating in it.

n. a person who, although present at some event, does not take part in it; an observer or spectator

n. One who stands near; a spectator; one who has no concern with the business transacting.

n. One who stands near; a spectator; a chance looker-on; hence, one who has no concern with the business being transacted.

n. One of the highest order of penitents in the discipline of the early church. See consistentes.

n. a nonparticipant spectator

"I will use the term participation unit to refer both to encounters and to unengaged participants; the term bystander will be used to refer to any individual present who is not a ratified member of the particular encounter in question, whether or not he is currently a member of some other encounter."

looker    watcher    spectator    viewer    witness   

looker on    beholder    observer    spectator    witness   

on-looker    spectator    outsider    listener    observer    passerby    passersby    villager    inquirer    participant