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

斯う[kou] in this way (used for something or someone close to the speaker, including the speaker himself, or for the opinions of the speaker)
斯う言う[kouiu] such
越幾斯[ekisu] extract (esp. of food, fruit, etc.)
瓦斯[gasu] gas
窒扶斯[chifusu] typhoid fever

斯くて[kakute] thus
螽斯[kirigirisu] Japanese katydid (Gampsocleis buergeri)
斯の[kono] this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)
愛斯蘭[aisurando] Iceland
然う斯う[soukou] this and that