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...
el óleo - oil paint, oil painting
el otoño - autumn, fall