サンプリング周波数[sanpuringushuuhasuu] sampling frequency
一周忌[isshuuki] first anniversary of death
一周期[isshuuki] period (in astronomy)
一周年[isshuunen] one full year
円周[enshuu] circumference

円周率[enshuuritsu] Pi (3.1415926..)
外周[gaishuu] outer circumference
基本周波数[kihonshuuhasuu] fundamental frequency
月経周期[gekkeishuuki] menstrual cycle
周章てる[awateru] to become confused (disconcerted, disorganized, disorganised)

山梔子[kuchinashi] Cape jasmine (Gardenia jasminoides)
悪巫山戯[warufuzake] prank
安土桃山時代[azuchimomoyamajidai] Azuchi-Momoyama period (approx. 1558-1600 CE)
案山子[kakashi] scarecrow
奥山[okuyama] remote mountain

岡山県[okayamaken] Okayama prefecture (Chuugoku area)
下山[gezan] descending (mountain)
夏山[natsuyama] summery mountain
火山[kazan] volcano
火山灰[kazanbai] volcanic ash