4-letter words that end in o
- buto — a contemporary expressionist dance form that originated in postwar Japan, first called Ankoku Butoh, or Dance of Utter Darkness.
- calo — a non-combatant servant to a soldier in the Roman army
- camo — camouflage
- capo — a device fitted across all the strings of a guitar, banjo, etc, so as to raise the pitch of each string simultaneously
- caro — Sir Antony. 1924–2013, British sculptor, best known for his abstract steel sculptures
- cato — Marcus Porcius (ˈmɑːkəsˈpɔːʃɪəs), known as Cato the Elder or the Censor. 234–149 bc, Roman statesman and writer, noted for his relentless opposition to Carthage
- cayo — Lb Latin America A small island or ledge of rock in the water; a key.
- cbso — City of Birmingham Symphony Orchestra
- cero — a large spiny-finned food fish, Scomberomorus regalis, of warm American coastal regions of the Atlantic: family Scombridae (mackerels, tunnies, etc)
- chao — a Vietnamese rice congee
- choo — (onomatopoeia) The sound of a locomotive whistle.
- ciao — Some people say 'Ciao' as an informal way of saying goodbye to someone who they expect to see again soon.
- cito — swiftly
- cleo — Clear Language for Expressing Orders
- clio — the Muse of history
- coco — the coconut palm tree
- codo — a city in NE Brazil.
- cogo — (application) A subsystem of ICES aimed at coordinate geometry problems in civil engineering.
- coho — a Pacific salmon, Oncorhynchus kisutch
- colo — (computing) co-location.
- como — a city in N Italy, in Lombardy at the SW end of Lake Como: tourist centre. Pop: 78 680 (2001)
- coro — a city in NW Venezuela.
- creo — (slang) short for creationist.
- cryo — (informal) cryoprecipitate.
- culo — the buttocks.
- cuso — Canadian University Services Overseas; an organization that sends students to work as volunteers in developing countries
- dado — A dado is a strip of wood that can be fixed to the lower part of a wall. The wall is then often decorated differently above and below the dado.
- dago — a member of a Latin race, esp a Spaniard or Portuguese
- dato — the chief of any of certain Muslim tribes in the Philippine Islands
- dcvo — Dame Commander of the Royal Victorian Order
- deco — of or having to do with art deco
- defo — definitely: an expression of agreement or consent
- demo — A demo is a demonstration by a group of people to show their opposition to something or their support for something.
- depo — (legal, informal) deposition.
- dero — a tramp or derelict
- deso — designated driver.
- devo — /dee'voh/ (In-house jargon at Symbolics) A person in a development group. See also doco and mango.
- dido — an antic; prank; trick
- dino — (informal) dinosaur.
- divo — a highly distinguished male singer
- dmso — dimethylsulphoxide
- doco — (UK, Australian, informal) abbreviation of documentary.
- dodo — any of several clumsy, flightless, extinct birds of the genera Raphus and Pezophaps, related to pigeons but about the size of a turkey, formerly inhabiting the islands of Mauritius, Réunion, and Rodriguez.
- dojo — The Dojo Toolkit
- duro — a peso of Spain or Spanish America.
- dyno — A rapid move across a rock face in order to reach a hold.
- ebro — a river flowing SE from N Spain to the Mediterranean. About 470 miles (755 km) long.
- ecco — look there!
- echo — a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other obstructing surface.
- ecmo — extracorporeal membrane oxygenation: a method of life support used to oxygenate the blood in newborn babies with lung failure, using a machine incorporating membranes that are impermeable to blood but permeable to oxygen and carbon dioxide