- conflagration: A great fire, as of many buildings, a forest, or the like.
- confluence: The place where streams meet.
- confluent: A stream that unites with another.
- conformable: Harmonious.
- conformance: The act or state or conforming.
- conformation: General structure, form, or outline.
- conformity: Correspondence in form, manner, or use.
- confront: To encounter, as difficulties or obstacles.
- congeal: To coagulate.
- congenial: Having kindred character or tastes.
- congest: To collect into a mass.
- congregate: To bring together into a crowd.
- coniferous: Cone-bearing trees.
- conjecture: A guess.
- conjoin: To unite.
- conjugal: Pertaining to marriage, marital rights, or married persons.
- conjugate: Joined together in pairs.
- conjugation: The state or condition of being joined together.
- conjunction: The state of being joined together, or the things so joined.
- connive: To be in collusion.
- connoisseur: A critical judge of art, especially one with thorough knowledge and sound judgment of art.
- connote: To mean; signify.
- connubial: Pertaining to marriage or matrimony.
- conquer: To overcome by force.
- consanguineous: Descended from the same parent or ancestor.
- conscience: The faculty in man by which he distinguishes between right and wrong in character and conduct.
- conscientious: Governed by moral standard.
- conscious: Aware that one lives, feels, and thinks.
- conscript: To force into military service.
- consecrate: To set apart as sacred.
- consecutive: Following in uninterrupted succession.
- consensus: A collective unanimous opinion of a number of persons.
- conservatism: Tendency to adhere to the existing order of things.
- conservative: Adhering to the existing order of things.
- conservatory: An institution for instruction and training in music and declamation.
- consign: To entrust.
- consignee: A person to whom goods or other property has been entrusted.
- consignor: One who entrusts.
- consistency: A state of permanence.
- console: To comfort.
- consolidate: To combine into one body or system.
- consonance: The state or quality of being in accord with.
- consonant: Being in agreement or harmony with.
- consort: A companion or associate.
- conspicuous: Clearly visible.
- conspirator: One who agrees with others to cooperate in accomplishing some unlawful purpose.
- conspire: To plot.
- constable: An officer whose duty is to maintain the peace.
- constellation: An arbitrary assemblage or group of stars.
- consternation: Panic.