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
la juntura - joint, junction, juncture, place...
la jungla - jungle
jaque, jaque mate - check, checkmate (chess terms)
el jarabe - syrup
la jalea - jelly, gelatin dessert
jaibón - pretentious, snobbish, stuck-up,...
el jengibre - ginger
la jeringuilla - syringe
la jirafa - giraffe
el karateka, la karateka - karate expert, someone who practices...
Jehová, el Jehová - Jehovah or Yahweh (name of God often...