Manservant is more common in historical contexts, reflecting past social structures. In period dramas, the lord always has a manservant to tend to him.
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Dated Term
The term 'manservant' can sound old-fashioned, as modern job titles may vary. He jokingly referred to his aide as his manservant.
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Upper Class
Manservant often implies employment in an affluent or aristocratic household. The mansion was so large that they employed a manservant to manage the estates.