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 bartender

n. an employee who mixes and serves alcoholic drinks at a bar

"The barkeep is cleaning the bar, so they have a seat at a window table, which they normally don't do."

employee   

tavern keeper    publican    barmaid   

barker   

bar-keeper    barkeeper   

railroader    pastrycook    pissing    laundryman    gigolo    familias    manicurist    petaq    nymphomaniac    bawd