One is the occipital bone.
Occipital bone
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Some words that start with the letter O are:oceanOddOdeofoffOfficeogreoldOliveOnoneOpalOppositeorOrangeorboreganoorganismorgasmorigamiotherotteroughtOxymoronoval
Femur, Fibula
knee capknee cap
Five letter words that start and end with letter O are outdo and outgo.
Oman is the only country that begins with the letter O.