Weapons with O
- Oar
 A sword is a weapon; 'old' is just a descriptor.
- oven
 Yes! Ancient Roman catapult siege weapon.
Yes! A gun is a real weapon; 'old' is fine.
Japanese chain-and-sickle weapon (Okinawan style).
- obelisk
 - Ozzie
 - ox bow
 - Ordnance
 - orangutang
 - Odor
 - oculus
 - Ornaments
 - Orange peel
 - opra
 - Open hand
 - Olive
 - Oden
 - Octopus ink
 - oxygen bomb
 - oxygen
 - Organ
 - Orcas
 - opiods
 - opera
 - opener
 - onyx
 - ocean
 - Oak bat
 
Slová v zozname Weapons with O pochádzajú od hráčov slovnej hry Meno, Mesto, Zviera, Vec.