O
obedient,obscene,obscure,odious,offend,offensive,optimistic,optimum,optional,ostentatious, outlandish,overwhelming
P
parallel,partial,pathetic,perilous,periodical,peripheral,permanent,permissible,perpendicular, perpetual,persistent,pessimistic,pious,plausible,poisonous,practicable,predominant,pregnant, prevalent,proficient,profound,prolific,prominent,promising,prompt,proportional,prosperous,prudent, punctual