la ludopatía - compulsive gambling, gambling addiction
  el lodazal - quagmire (literal or figurative), bog
  la logopedia - speech therapy, the science or study...
  la lenteja - lentil
  el lavaplatos - dishwasher (machine)<br>...
  la llanta - rim (of a wheel or tire)
  el lactante, la lactante - a baby who breastfeeds, a baby who...
  el lucro - earnings, profit, financial gain
  la llana - trowel
  el juicio - trial, sanity, good judgment, opinion
  el judío, la judía - Jew
  el jugo - juice, sap, something of substance or...
  el juanete - bunion
  el kilometraje - mileage, but using kilometers rather...
  justo - just, fair (in the sense of being...
  el judas - traitor, betrayer
  el juguete - toy, plaything
  el jamón - ham
  la jabalina - javelin
  la jarra - jug, pitcher, mug (as for beer)