Common Words
* Collect: To gather or bring together.
* College: An institution of higher learning.
* Collar: A band worn around the neck.
* Collapse: To fall down suddenly.
* Collide: To come together with force.
* Colony: A group of people living in a new territory.
* Color: The hue or shade of something.
* Column: A vertical support.
* Combat: A fight or struggle.
* Combustion: The process of burning.
* Command: To give an order.
* Comment: To express an opinion.
* Commit: To do something.
* Common: Shared by all.
* Communicate: To share information.
* Company: A group of people.
* Compare: To examine the similarities and differences.
* Compass: A device for navigation.
* Compel: To force.
* Complete: To finish.
* Complex: Having many parts.
* Complicate: To make more difficult.
* Compose: To create.
* Comprehend: To understand.
* Compute: To calculate.
* Concede: To admit defeat.
* Concentrate: To focus.
* Concept: An idea.
* Concern: To worry.
* Conclude: To end.
* Concrete: A building material.
* Condemn: To criticize harshly.
* Condition: A state of being.
* Conduct: To lead or manage.
* Confess: To admit to a crime.
* Confidence: A feeling of certainty.
* Confirm: To verify.
* Conflict: A fight.
* Conform: To follow rules.
* Congratulate: To express pleasure at someone's success.
* Connect: To join together.
* Conscious: Aware.
* Consent: To agree.
* Consequence: A result.
* Consider: To think about.
* Consistent: Always the same.
* Construct: To build.
* Consult: To ask for advice.
* Consume: To eat or drink.
* Contact: To communicate.
* Contain: To hold.
* Contend: To argue.
* Content: Satisfied.
* Contest: To compete.
* Continue: To carry on.
* Contract: An agreement.
* Contrast: To compare differences.
* Contribute: To give something.
* Control: To have power over.
* Controversy: A disagreement.
* Convene: To meet.
* Converse: To talk.
* Convert: To change.
* Convey: To communicate.
* Convince: To persuade.
* Cook: To prepare food.
* Cool: To become colder.
* Cooperate: To work together.
* Coordinate: To organize.
* Copy: To make a duplicate.
* Correct: To make right.
* Correlate: To connect.
* Cost: The price.
* Council: A group of advisors.
* Count: To number.
* Country: A nation.
* Couple: Two things together.
* Courage: Bravery.
* Course: A path.
* Court: A place of justice.
* Cover: To protect.
* Create: To make.
* Credit: To acknowledge.
* Creep: To move slowly.
* Crisis: A difficult situation.
* Criticize: To find fault.
* Crop: A plant grown for food.
* Cross: To go over.
* Crowd: A large group of people.
* Crucial: Very important.
* Crush: To press hard.
* Cry: To weep.
* Cultivate: To grow.
* Culture: The customs of a society.
* Curious: Wanting to know.
* Current: Happening now.
* Curse: To put a hex on someone.
* Custom: A tradition.
Less Common Words
* Colossal: Very large.
* Colleague: A fellow worker.
* Collateral: Security for a loan.
* Colloquial: Informal language.
* Collusion: Secret agreement.
* Colossus: A giant statue.
* Colonnade: A row of columns.
* Colonel: A high-ranking military officer.
* Colonize: To establish a colony.
* Coloratura: A type of singing.
* Colossal: Extremely large.
* Commemorate: To remember.
* Compendium: A collection of information.
* Compensate: To make up for a loss.
* Complement: To enhance.
* Complicated: Difficult to understand.
* Compulsory: Required.
* Concur: To agree.
* Condense: To make shorter.
* Confederation: A group of states.
* Configuration: The arrangement of parts.
* Confine: To restrict.
* Congregate: To gather.
* Congruent: Identical.
* Conjecture: A guess.
* Conjunction: A word that joins words or phrases.
* Connate: Existing at birth.
* Connotation: An implied meaning.
* Conscience: A sense of right and wrong.
* Consciousness: Awareness.
* Consecutive: Following one after the other.
* Conserve: To save.
* Considerable: Large or important.
* Consist: To be made up of.
* Consolidate: To combine.
* Consonant: A sound made with the mouth closed.
* Constant: Unchanging.
* Constitute: To form.
* Constrain: To restrict.
* Construct: To build.
* Consult: To seek advice.
* Consume: To eat or drink.
* Contact: To communicate.
* Contagious: Spread easily.
* Contemplate: To think carefully.
* Contemporary: Happening now.
* Contest: To compete.
* Context: The circumstances surrounding an event.
* Continual: Happening frequently.
* Contradict: To say the opposite.
* Contribute: To give.
* Control: To have power over.
* Convince: To persuade.
* Conventional: Traditional.
* Converge: To meet.
* Converse: To talk.
* Convert: To change.
* Convex: Curved outward.
* Convey: To communicate.
* Convict: To find guilty.
* Cooperative: Working together.
* Coordinate: To organize.
* Copious: Abundant.
* Cordially: Warmly.
* Core: The center.
* Cornerstone: A foundation.
* Corporate: Relating to a company.
* Corrupt: Dishonest.
* Cosmopolitan: Worldly.
* Counterfeit: Fake.
* Courageous: Brave.
* Courtesy: Politeness.
* Covenant: An agreement.
* Cover: To protect.
* Cower: To shrink in fear.
* Covet: To desire.
* Crackle: To make a snapping sound.
* Cranium: The skull.
* Create: To make.
* Credible: Believable.
* Credulous: Easily fooled.
* Creep: To move slowly.
* Crest: The top of a hill.
* Critical: Important.
* Critique: To analyze.
* Crow: To make a loud noise.
* Crucible: A severe test.
* Crude: Rough.
* Cruise: To sail slowly.
* Culinary: Relating to cooking.
* Culminate: To reach the highest point.
* Cultivate: To grow.
* Cunning: Clever.
* Cupid: The god of love.
* Curious: Wanting to know.
* Current: Happening now.
* Curriculum: A course of study.
* Curtain: A piece of fabric used for covering a window.
* Custom: A tradition.
* Cynical: Doubtful of good intentions.
This is just a small selection of words beginning with "col-." There are many more, and the list can be expanded to include more technical or obscure terms.