悪球[akkyuu] hard ball to hit
逸球[ikkyuu] muffed ball
衛星地球局[eiseichikyuukyoku] (satellite) earth station
眼球[gankyuu] eyeball
気球[kikyuu] balloon

球戯[kyuugi] billiards
球技[kyuugi] ball game (e.g. baseball, tennis, soccer)
球菌[kyuukin] coccus
球形[kyuukei] globular or spherical shape

琉璃[ruri] lapis lazuli
琉球列島[ryuukyuurettou] Ryukyu Islands
琉球諸島[ryuukyuushotou] Ryukyu Islands
琉球音階[ryuukyuuonkai] Okinawan scale (hemitonic pentatonic scale: do, mi, fa, so, ti)
琉球語[ryuukyuugo] Ryukyuan languages

琉歌[ryuuka] Okinawan fixed form poetry
三筋琉球雀鯛[misujiryuukyuusuzumedai] whitetail dascyllus (Dascyllus aruanus, species of damselfish from the Indo- West Pacific)
琉球芋[ryuukyuuimo] sweet potato (Ipomoea batatas)
琉球藍[ryuukyuuai] Assam indigo (Strobilanthes cusia)
琉球古武術[ryuukyuukobujutsu] Okinawan kobudo

鮎並女[ainame] fat greenling (Hexagrammos otakii)
落ち鮎[ochiayu] sweetfish going downstream to spawn
稚鮎[chiayu] young ayu
若鮎[wakaayu] young (healthy & energetic) sweetfish
鮎漁[ayuryou] fishing for ayu

鮎並科[ainameka] Hexagrammidae (family of marine fishes incorporating the greenlings)
鮎釣り[ayutsuri] ayu fishing
鮎掛け[ayukake] fourspine sculpin (Cottus kazika)
鮎擬[ayumodoki] kissing loach (Leptobotia curta)