夷俗[izoku] customs of the barbarians
雅俗[gazoku] refined and vulgar
還俗[genzoku] return to secular life
旧俗[kyuuzoku] old customs
古俗[kozoku] old custom

州俗[shuuzoku] local customs
淳風美俗[junpuubizoku] good morals and manners
世俗[sezoku] common customs
世俗化[sezokuka] secularization
世俗主義[sezokushugi] secularism

垂迹[suijaku] temporary manifestation by a buddha (in order to save people)
筆迹[hisseki] handwriting
真迹[shinseki] true autograph

事迹[jiseki] evidence
本地垂迹説[honjisuijakusetsu] manifestation theory (holding that Shinto gods are manifestations of buddhas)
迹門[shakumon] first half of the Lotus Sutra, in which the Buddha appears as a spatiotemporally restricted being