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

祓い清める[haraikiyomeru] to purify
お祓い[oharai] exorcism rite
修祓[shubatsu] purification rite (esp. one held prior to a Shinto event)
大祓い[ooharae] great purification
禊祓[misogiharae] form of Shinto purification

祓う[harau] to exorcise
名越しの祓[nagoshinoharae] summer purification rites (held at shrines on the last day of the 6th lunar month)
善祓[yoshiharae] purification to invite good fortune
悪祓[ashiharae] purification to cleanse one of sin