You could use Northwest Ordinance or "old"
Odessa.
Y. O. Fortier has written: 'Geology of the north-central part of the Arctic Archipelago, Northwest Territories' -- subject(s): Geology
A few things that start with o and have to do with the winter are oreos to put out for Santa. That's one thing that starts with an o and it has to do with winter but mostly Christmas.
overcoatovershoesobi (kimono sash)
Do you mean what Norse god starts with o? Odin is a Norse go that starts with O.
Oven, oil, and I think "Opener, can" or "Can Opener" will probably work.
Greensburg is a city in Pennsylvania
· Oman is a country that sends athletes to participate in the Olympics
Omoo is the Melville tale that starts with O.
A machine that starts with O is an oscillating fan.
an octopus is a simple machine that starts with a o