御金[okane] money
金糸雀[kinshijaku] canary (esp. the island canary, Serinus canaria)
違約金[iyakukin] penalty for contract breach
一刻千金[ikkokusenkin] every moment is precious
一字千金[ichijisenkin] word of great value

一時金[ichijikin] lump sum
一時賜金[ichijishikin] lump-sum grant
引き金を引く[hikiganewohiku] to pull the trigger
引当金[hikiatekin] reserves
隠れ借金[kakureshakkin] hidden debts

闇い[kurai] dark
暗闇[kurayami] darkness
闇然[anzen] dark
闇雲[yamikumo] recklessly
闇愚[angu] imbecility

闇値[yamine] black-market price
闇路[yamiji] dark road
五月闇[satsukiyami] dark night in the rainy season
無闇に[muyamini] thoughtlessly