1. Operate → Cooperate (v)

Meaning: to work together with others
Example: The two teams agreed to cooperate on the project.

Common collocations:

• cooperate with someone

• cooperate fully

• cooperate closely

2. Worker → Coworker (n)

Meaning: a person you work with
Example: I often have lunch with my coworkers.

Common collocations:

• friendly coworker

• support from coworkers

• relationship with coworkers

3. Author → Coauthor (n / v)

Meaning: a person who writes something together with another person
Example: She coauthored a research paper.

Common collocations:

• coauthor a book

• coauthor an article

• coauthor with someone

4. Founder → Cofounder (n)

Meaning: one of two or more people who start a company or organisation
Example: He is the cofounder of a tech startup.

Common collocations:

• company cofounder

• cofounder and CEO

• cofounder role

5. Worker → Coworking (adj / n)

Meaning: shared working space used by different people or companies
Example: She rents a desk in a coworking space.

Common collocations:

• coworking space

• coworking office

• coworking community

6. Pilot → Copilot (n)

Meaning: the second pilot who assists the main pilot
Example: The copilot helped land the plane safely.

Common collocations:

• pilot and copilot

• flight copilot

7. Parent → Coparent (v / n)

Meaning: to share responsibility for raising a child
Example: They coparent their children after divorce.

Common collocations:

• coparent successfully

• coparenting arrangement

• cooperative coparenting

8. Producer → Coproduce (v)

Meaning: to produce something together with others
Example: The film was coproduced by two studios.

Common collocations:

• coproduced film

• coproduce a project

• international coproduction

9. Exist → Coexist (v)

Meaning: to live or exist together peacefully
Example: Different cultures can coexist in one city.

Common collocations:

• coexist peacefully

• coexist with

• cultural coexistence

10. Operation → Coordination (n)

Meaning: organising people or activities to work together effectively
Example: The event required careful coordination.

Common collocations:

• close coordination

• coordination between teams

• improve coordination