Similar to orca
- orsus – a beginning, initiative, start, to begin, undertaking
- orgia – a festival of mysteries, orgy
- orchadis – a type of olive
- orchas – a type of olive
- orbita – a wheel rut
- ordinarius – according to order, ordinary, regular
- ornamentum – accoutrement, decorations, distinction, equipment, furniture, honor, kit, trappings, weapons