We don't have synonyms for on pension yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are en pension and outpension.
(n) :
a boarding house or small hotel in Europe; accommodations or the payment for accommodations, especially at a boarding house or small hotel in Europe
""A pension had somewhat less to offer than a hotel; it was always smaller, and never elegant; it sometimes offered breakfast, and sometimes not" (John Irving)."
(n) :
a boarding house or small hotel in Europe; accommodations or the payment for accommodations, especially at a boarding house or small hotel in Europe
""A pension had somewhat less to offer than a hotel; it was always smaller, and never elegant; it sometimes offered breakfast, and sometimes not" (John Irving)."