Thing with O
- A round citrus fruit with sweet, juicy taste. 
- A kitchen appliance used for baking or roasting. 
- A sea creature with eight arms. 
- A thick liquid used in cooking or machines. 
- A small green or black fruit eaten or pressed for oil. 
- A round vegetable with layers and strong flavor. 
- Oval
- Plural of orange, round citrus fruits. 
- Plural of olive, small edible fruits. 
- Grain used for porridge and cereals. 
- A vast body of salt water covering Earth. 
- A colorful gemstone that reflects light. 
- A strong tree that produces acorns. 
- A decorative object used for beauty. 
- A polygon with eight sides and eight angles. 
- A huge bird that runs fast - definitely a thing. 
- A playful aquatic mammal - yep, a real thing. 
- A musical instrument or body part - both real things. 
- A padded footstool or bench you rest on. 
- A popular chocolate sandwich cookie brand. 
- A long paddle used to row a boat. 
- A nocturnal bird with big eyes, a real thing. 
- A warm breakfast made from oats, real food. 
- A staged musical drama - an art form, a thing. 
- Oboe
- Office
- Oat
- Opener
- Orb
- Orangutan
- Onions
- Objects
- ore
- Origami
- Oak tree
- Opals
- Oscar
- Oyster
- Oro
- Ovals
- oasis
- Ointment
- olive oil
- oxygen
- Orchid
- Oracle
- orange juice
- Opium
- Ornaments
- Oregano
- Ogre
- Overalls
- otters
- okra
- Organs
- Oars
- Ovary
- Outlet
- Omelette
- Order
- Owls
- outfit
- Onyx
- ovaries
- orphan
- oculus
- Orchestra
- Orgasm
- orca
- omelet
- Oxen
- Orbs
- old people
- Odor
- Ozone
- Other
- Ostriches
- open door
- Obstacle
- outside
- Outhouse
- Onesie
- ocarina
- Oral
- Ola
- ocelot
- ora
- old
- ostrich egg
- Orange peel
- Oblong
- Oscars
- organizer
- Orangutans
- omen
- Octagons
The words in the list Thing with O come from players of the word game Categories game.