PORTCULLIS, "—of coin," some old coins have a portcullis stamped on their reverse (Whalley).
PORTENT, marvel, prodigy; sinister omen.
PORTENTOUS, prophesying evil, threatening.
PORTER, references appear "to allude to Parsons, the king's porter, who was...near seven feet high" (Whalley).
POSSESS, inform, acquaint.
POST AND PAIR, a game at cards.
POSY, motto. (See Poesie).
POTCH, poach.
POULT-FOOT, club-foot.
POUNCE, claw, talon.