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

一秒[ichibyou] one second
数秒[suubyou] several seconds
寸秒[sunbyou] a moment
秒針[byoushin] second hand (of clock)
秒速[byousoku] per second

秒読み[byouyomi] countdown
分秒[funbyou] moment
毎秒[maibyou] every second
秒時計[byoudokei] stop watch