We don't have synonyms for pump rooms yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pump room.
(n) :
(sometimes capitalized) A room housing a pump, especially a room or structure at a spa where mineral water is drawn from a spring and consumed, formerly often serving as a venue for polite socializing and conversation.
(n) :
(sometimes capitalized) A room housing a pump, especially a room or structure at a spa where mineral water is drawn from a spring and consumed, formerly often serving as a venue for polite socializing and conversation.