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)
   
el jefe, la jefa - chief, boss, manager, leader, head...
   
el kayac - kayak, kayaking
   
juvenil - youthful, youth-oriented, juvenile
   
justificable - justifiable
   
la jerarquía - hierarchy, someone high in the hierarchy