Someone who manages the running of a home, traditionally the female head of the household.
Someone (traditionally a woman) employed to look after the home, typically by managing domestic servants or superintending household management; also someone with equivalent duties in a hotel, institution etc.
The member of staff at a restaurant who keeps the wine cellar and advises the guests on a choice of wines; a wine steward / stewardess, a wine waiter / waitress / server.
To act as a sommelier.