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

諱む[imu] to avoid
忌諱[kiki] displeasure
後の諱[nochinoimina] posthumous name

偏諱[henki] one kanji in the name of a nobleperson (with a multiple-kanji name)
偏諱を賜う[henkiwotamau] (of a nobleperson) to bestow one of the kanji in one's name upon someone (e.g. a meritorious retainer, a boy coming of age, etc.)
遠諱[onki] semicentennial memorial service