We don't have synonyms for dementias yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are dementia, demential and dementis.
(n) :
(pathology) A progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging. Areas particularly affected include memory, attention, judgement, language and problem solving.
(n) :
(pathology) A progressive decline in cognitive function due to damage or disease in the brain beyond what might be expected from normal aging. Areas particularly affected include memory, attention, judgement, language and problem solving.