兌換[dakan] conversion (of paper money, esp. into specie)
兌換銀行[dakanginkou] bank of issue

兌換券[dakanken] convertible banknotes

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