9-letter words containing a, c, t, o, s
- castrator — One who castrates (gelds or neuters).
- castroism — the philosophy and policies of Fidel Castro and his followers
- castroist — of or relating to the philosophy and policies of Fidel Castro and his followers
- catacombs — an underground burial place, esp the galleries at Rome, consisting of tunnels with vaults or niches leading off them for tombs
- catholics — Plural form of Catholic.
- cathouses — Plural form of cathouse.
- causation — The causation of something, usually something bad, is the factors that have caused it.
- cautelous — crafty or cunning
- caveators — a person who files or enters a caveat.
- ceanothus — any shrub of the North American rhamnaceous genus Ceanothus: grown for their ornamental, often blue, flower clusters
- cenotaphs — Plural form of cenotaph.
- ceratodus — any of various extinct lungfish constituting the genus Ceratodus, common in Cretaceous and Triassic times
- certosina — a technique of inlaying light-colored material, as bone, ivory, metal, or pale wood, in elaborate designs on a dark ground.
- cessation — The cessation of something is the stopping of it.
- cetaceous — Relating to whales or more generally to any marine mammal of the order Cetacea.
- cetshwayo — ?1826–84, king of the Zulus (1873–79): defeated the British at Isandhlwana (1879) but was overwhelmed by them at Ulundi (1879); captured, he stated his case in London, and was reinstated as ruler of part of Zululand (1883)
- chamosite — a mineral of the chlorite group, hydrous aluminum silicate of iron, occurring in gray or black crystals in oolitic iron ore.
- charoseth — haroseth.
- chaseport — a porthole through which a gun was fired
- chassepot — a breech-loading bolt-action rifle formerly used by the French Army
- chat show — A chat show is a television or radio show in which people talk in a friendly, informal way about different topics.
- chatrooms — Plural form of chatroom.
- chelators — Plural form of chelator.
- chemostat — an apparatus for growing bacterial cultures at a constant rate by controlling the supply of nutrient medium
- chlorates — Plural form of chlorate.
- chopsteak — chopped steak.
- choralist — a person who sings in a chorus or ensemble
- chordates — belonging or pertaining to the phylum Chordata, comprising the true vertebrates and those animals having a notochord, as the lancelets and tunicates.
- chromates — Plural form of chromate.
- citations — Plural form of citation.
- clafoutis — a French baked pudding
- claystone — a compact very fine-grained rock consisting of consolidated clay particles
- clinostat — an apparatus for studying tropisms in plants, usually a rotating disc to which the plant is attached so that it receives an equal stimulus on all sides
- cloacitis — inflammation of the cloaca in birds, including domestic fowl, and other animals with a common opening of the urinary and gastrointestinal tracts
- cloistral — of, like, or characteristic of a cloister
- coastally — In a coastal manner.
- coastland — the land fringing a coast
- coastline — A country's coastline is the outline of its coast.
- coastward — towards the coast
- coastwise — along the coast
- coatdress — a coatlike dress having a buttoned front and, usually, lapels and long sleeves
- coatracks — Plural form of coatrack.
- coatstand — a frame or pole equipped with hooks or arms for hanging up coats, etc
- coattails — If you do something on the coattails of someone else, you are able to do it because of the other person's success, and not because of your own efforts.
- coauthors — Plural form of coauthor.
- cobaltous — of or containing cobalt in the divalent state
- cocainist — a cocaine addict
- cockatoos — Plural form of cockatoo.
- cockboats — Plural form of cockboat.
- cocktails — Plural form of cocktail.