Oceanography also called marine science.
Orthodontist
Oil exploration engineer is an engineering career. It starts with the letter o.
Overalls
Ohio
Ominous
O (Othello) (2001)
Oxygen and osmium are chemical elements. They begin with the letter O.
Auto
Yes, the Odyessey and the Outback.
Outwear, outerwear
Some words that start with the letter O are:oceanOddOdeofoffOfficeogreoldOliveOnoneOpalOppositeorOrangeorboreganoorganismorgasmorigamiotherotteroughtOxymoronoval
Yes, owl and octopus both start with the letter O.
I am not aware of any cities in Massachusetts that start with the letter O. However, Oxford, Orange, Orleans, Oak Bluff, and Otis are towns in Massachusetts.