海鷂魚[ei] ray (fish)
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一天四海[ittenshikai] the world
雲海[unkai] sea of clouds
沿海[enkai] coast

遠海[enkai] deep sea
黄海[koukai] Yellow Sea
温海[atsumi] warm sea
海の幸[uminosachi] seafood

石筍[sekijun] stalagmite
筍生活[takenokoseikatsu] selling one's personal effects in order to live
筍医者[takenokoisha] inexperienced doctor
雨後の筍[ugonotakenoko] similar things turning up one after another

筍虫[takenokomushi] horse botfly larva
筍貝[takenokogai] auger shell (Terebra subulata)
海筍貝[umitakegai] dilate piddock (Barnea dilatata)

ムール貝[muurugai] moule
一枚貝[ichimaigai] univalve
烏貝[karasugai] cockscomb pearl mussel (Cristaria plicata)
貝ボタン[kaibotan] mother-of-pearl button
貝貨[baika] shell money

貝がら[kaigara] shell
貝柱[kaibashira] adductor muscle
貝毒[kaidoku] shellfish poison
貝類[kairui] shellfish