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

空オケ[karaoke] karaoke (singing to taped accompaniment)
ベクトル空間[bekutorukuukan] vector space
茜さす空[akanesasusora] glowing sky
圧搾空気[assakukuuki] compressed air
圧縮空気[asshukukuuki] compressed air

位相空間[isoukuukan] phase space (physics)
宇宙空間[uchuukuukan] outer space
雨空[amazora] rainy sky
英国航空[eikokukoukuu] British Airways
仮想空間[kasoukuukan] virtual space (e.g. in computer graphics)

暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
海陸[kairiku] land and sea
旧大陸[kyuutairiku] the Old World
緊急着陸[kinkyuuchakuriku] emergency landing
空陸[kuuriku] land and air

在日米陸軍[zainichibeirikugun] US Army, Japan
上陸[jouriku] landing
上陸用舟艇[jourikuyoushuutei] landing craft
水陸[suiriku] land and water