la pastilla - tablet, pill, bar (of soap), piece...
  el pastor, la pastor - shepherd
  la plancha - iron (used in ironing clothing), the...
  el plenilunio - full moon
  pródigo - lavish, extravagant, productive,...
  la playa - beach, beach resort, seaside
  el papagayo - parrot
  precoz - precocious, early, maturing early,...
  la pantufla - slipper
  la orilla - shore, bank (of a river), edge
  olvidadizo - forgetful
  el ovni - UFO, unidentified flying object
  la ojeada - glance or look (as a noun)
  oblicuo - oblique, slanting, at an angle
  la oca - goose
  el ombligo - navel
  la ONU (Organización de las Naciones Unidas) - U.N. (United Nations)
  la oblea - wafer
  la onza - ounce, a small square of chocolate
  el olfato - sense of smell, instinct or a...