pena, f., pain, penalty, trouble, bother, affliction, grief, difficulty; á duras —s, with great difficulty.
penacho, m., panache, crest, plume(s).
penalidad, f., hardship, suffering.
penar, to suffer torment; andar penando, to suffer torment.
pender, to hang, be suspended; — de, to depend upon; to wait for; pendiente de, while waiting for; until I learned.
pendiente, f., slope.
pendón, m., banner, pennant, standard.
péndulo, m, pendulum, (here) tick (of the pendulum).
penetrante, penetrating.