どん底[donzoko] very bottom
井底[seitei] well bottom
海底[kaitei] bottom of the ocean
海底ケーブル[kaiteikeeburu] undersea cable
丸底[maruzoko] round-bottom

基底[kitei] base
靴底[kutsuzoko] shoe sole
黒底翳[kurosokohi] black cataract
根底[kontei] root
周知徹底[shuuchitettei] (something) known to all

芥箱[gomibako] garbage can
げた箱[getabako] shoe rack (in genkan)
化粧箱[keshoubako] vanity case
救急箱[kyuukyuubako] first-aid kit
仕事箱[shigotobako] workbox

私書箱[shishobako] post office box
慈善箱[jizenbako] charity box
主の箱[shunohako] Ark of the Lord
手箱[tebako] (small) box to keep valuables, etc.
重箱[juubako] multi-tiered food box