The initial idioms of the letter O

organic light-emitting diode	organic phenomenon
organic process	organic structure
organically	organicism
organification	organisation
organisational	organise
organised	organiser
organism	organismal
organismic	organist
organization	organization chart
organization expense	Organization for the Prohibition of Chemical Weapons
organization man	Organization of American States
Organization of Petroleum-Exporting Countries	Organization of the Oppressed on Earth
organizational	organize
organized	organized crime
organized labor	organized religion