Orienteering is the answer you are looking for
Off-road racing is a sport that begins with the letter o. There are a number of off-road races including The Baja 1000.
The Ohio Buckeye tree begins with O. The Oriental Plane tree begins with O.
Bombs are overpowering and destructive. The adjective begins with the letter O.
odessa
Oh, ello!
Obstetrician is a job title. It begins with o and is 12 letters long.
Off-road racing is a popular sport. It begins with the letter o.
Onion.
Orlando
Ovid
Olympus
otherwise
onion
Octopush Also known as underwater hockey.
OOOG
orlon
onion