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

鄙見[hiken] my humble opinion
鄙語[higo] vulgar expression
鄙賤[hisen] low class
鄙俗[hizoku] vulgarity
鄙劣[hiretsu] mean

鄙猥[hiwai] indecent
辺鄙[henpi] hard to reach place
野鄙[yahi] vulgar
鄙びる[hinabiru] to become rustic