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

牛脂[gyuushi] beef tallow
凝脂[gyoushi] solidified oil
脂薬[aburagusuri] plaster
合成樹脂[gouseijushi] plastics

脂が乗る[aburaganoru] to get into the swing of (one's work)
脂身[aburami] fat meat
脂性[aburashou] fatty constitution
脂っ濃い[aburakkoi] greasy

鯥五郎[mutsugorou] mudskipper (Boleophthalmus pectinirostris)
川鯥[kawamutsu] dark chub (Nipponocypris temminckii)
赤鯥[akamutsu] blackthroat seaperch (Doederleinia berycoides)

油底鯥[aburasokomutsu] escolar (Lepidocybium flavobrunneum)
沼鯥[numamutsu] Nipponocypris sieboldii (species of cyprinid)
薔薇鯥[baramutsu] oilfish (Ruvettus pretiosus)