As nouns the difference between idiosyncracy and idiocracy
is that idiosyncracy is while idiocracy is government that is based upon abstract theory or idiocracy can be (humorous) a government ruled by idiots.
idiosyncracy
English
Noun
(idiosyncracies)
Usage notes
* This spelling is commonly considered a misspelling; etymologically the preferred spelling is idiosyncrasy'', which is also the only spelling given by most dictionaries, such as the ''Dictionary.com Unabridged'' gives both spellings, but under the entry name ''idiosyncrasy .
References
idiocracy
English
Etymology 1
Noun
(idiocracies)
government that is based upon abstract theory
Etymology 2
Noun
(idiocracies)
(humorous) A government ruled by idiots.