衛生基準[eiseikijun] health standards
下準備[shitajunbi] preliminary arrangements
間接照準射撃[kansetsushoujunshageki] indirect fire
規準化[kijunka] normalization
技術水準[gijutsusuijun] state-of-the-art

公準[koujun] postulate (in math, logic, etc.)
高水準[kousuijun] high level
準える[nazoraeru] to pattern after
準じる[junjiru] to follow

謎謎[nazonazo] riddle
謎解き[nazotoki] solution of a riddle
謎をかける[nazowokakeru] to pose a riddle

謎めく[nazomeku] to be enigmatic or puzzling
謎掛け[nazokake] a particular type of riddle
謎を解く[nazowotoku] to solve a mystery