幻を追う[maboroshiwoou] to pursue an illusion
幻影[genei] phantom
幻覚[genkaku] hallucination
幻覚剤[genkakuzai] hallucinogen
幻姿[genshi] apparition

幻視[genshi] visual hallucination
幻想[gensou] illusions
幻想劇[gensougeki] non-realistic drama
幻像[genzou] phantom

研鑚[kensan] diligent study
鑚り火[kiribi] striking sparks with flint and steel or by rubbing sticks together (usu. to start a fire)

鑚孔機[sankouki] boring machine
鑚る[kiru] to start a fire (with wood-wood friction or by striking metal against stone)