We don't have synonyms for oligomania yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are logomania, oniomania and clinomania.
(n) :
(medicine, archaic) A form of insanity which, although potentially affecting all the mental faculties and operations, apparently involves only a part as the emotions, the intellect, or the will.
(n) :
(medicine, archaic) A form of insanity which, although potentially affecting all the mental faculties and operations, apparently involves only a part as the emotions, the intellect, or the will.