O Oak Knoll Naval Hospital Oakland Oakland Bridge Oakley, Annie oar, with an oblagata occultist occupants of the throne occupational disease octubre Odd Fellow odd man out oddbeat odiferous off base off the bat offball off-base offend, with off-line Ogpu oh, brother ohmiwhums Oklahoma Oklahomah ol' Paint 'old Old Bailey old days Old Hundred old school tie 'ole Ole Doe Methuselah O'Leary, Mrs Oliver Twist Ollie Om, mani padme hum O-Meter oncet uponet a timet One World one-man band one-shot onions, knowing (one's) on-the-bally onus oogly-boogly rotor bug drives oogly-boogly-bug-rug ooger-drive 'op open sesame open up the ball open-and-closed opening gun operation bootstrap Ophir ophthalmialitis Oppenheimer orangicate orazone order arms order of the day order of, on the Oregon pine original sin 'orrible Orville and Wilbur Orwell ostrich plumes, wore Oswald Ouspensky Outrigger, The over the tin cup overt doth speak loudly in accusation, the Overture of 1812 overwhump overwhumped overwhumpingness Oxford Oxfordian English Oxfordians