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

思惟[shii] thought
惟う[omou] to think
惟神[kannagara] as a god
惟神の道[kannagaranomichi] the way of the gods

半跏思惟像[hankashiizou] Buddhist statue of a figure sitting contemplatively in the half-lotus position (often of Maitreya)
惟うに[omouni] presumably
惟みる[omoimiru] to reflect carefully