御中[onaka] stomach
御話中[ohanashichuu] busy (phone)
アル中[aruchuu] alcoholism
π中間子[paichuukanshi] pi meson
暗中[anchuu] in the dark

暗中摸索[anchuumosaku] groping in the dark
意中[ichuu] one's mind
意中の女[ichuunoonna] sweetheart
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一日中[ichinichijuu] all day long

宇宙帽[uchuubou] space helmet
烏帽子[eboshi] black-lacquered headgear (made of silk, cloth or paper) originally worn by court nobles in ancient Japan, and afterwards spreading to the common people
夏帽子[natsuboushi] summer hat
角帽[kakubou] mortarboard
学帽[gakubou] school cap

軍帽[gunbou] military cap
三角帽[sankakubou] three-cornered hat
制服制帽[seifukuseibou] cap and uniform
制帽[seibou] regulation cap
正帽[seibou] cap of a uniform