Mammoth Uncensored Word List:
81 words ending with cy, 12 letters long

alkalescency ambitendency arithmocracy arithmomancy belligerency clairvoyancy codependency concomitancy concubitancy constituency coscinomancy cottonocracy despotocracy diathermancy dissentiency dollarocracy equipollency eurocurrency extravagancy gerontocracy gynaecocracy idiosyncracy illegitimacy impermanency impertinency inadvertency inarticulacy incompetency incompliancy incontinency independency indifferency inefficiency inexpectancy inexpediency interjacency intermediacy intumescency kakistocracy lampadomancy monochromacy multipotency multivalency noncandidacy nonconjugacy nondemocracy nonemergency nonresidency omphalomancy ornithomancy pantisocracy pedantocracy pentavalency plenipotency pluripotency polypharmacy precipitancy predominancy preoccupancy prodemocracy protuberancy radiolucency resipiscency resplendency revivescency reviviscency scapulimancy scapulomancy significancy somnivolency squattocracy subordinancy subserviency supersecrecy tetravalency transcalency transiliency translucency transparency undertenancy unregeneracy